Update expat to 2.4.1

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-
-
-# Expat, Release 2.2.9
-
-This is Expat, a C library for parsing XML, started by
-[James Clark](https://en.wikipedia.org/wiki/James_Clark_(programmer)) in 1997.
-Expat is a stream-oriented XML parser.  This means that you register
-handlers with the parser before starting the parse.  These handlers
-are called when the parser discovers the associated structures in the
-document being parsed.  A start tag is an example of the kind of
-structures for which you may register handlers.
-
-Expat supports the following compilers:
-- GNU GCC >=4.5
-- LLVM Clang >=3.5
-- Microsoft Visual Studio >=8.0/2005
-
-Windows users should use the
-[`expat_win32` package](https://sourceforge.net/projects/expat/files/expat_win32/),
-which includes both precompiled libraries and executables, and source code for
-developers.
-
-Expat is [free software](https://www.gnu.org/philosophy/free-sw.en.html).
-You may copy, distribute, and modify it under the terms of the License
-contained in the file
-[`COPYING`](https://github.com/libexpat/libexpat/blob/master/expat/COPYING)
-distributed with this package.
-This license is the same as the MIT/X Consortium license.
-
-If you are building Expat from a check-out from the
-[Git repository](https://github.com/libexpat/libexpat/),
-you need to run a script that generates the configure script using the
-GNU autoconf and libtool tools.  To do this, you need to have
-autoconf 2.58 or newer. Run the script like this:
-
-```console
-./buildconf.sh
-```
-
-Once this has been done, follow the same instructions as for building
-from a source distribution.
-
-To build Expat from a source distribution, you first run the
-configuration shell script in the top level distribution directory:
-
-```console
-./configure
-```
-
-There are many options which you may provide to configure (which you
-can discover by running configure with the `--help` option).  But the
-one of most interest is the one that sets the installation directory.
-By default, the configure script will set things up to install
-libexpat into `/usr/local/lib`, `expat.h` into `/usr/local/include`, and
-`xmlwf` into `/usr/local/bin`.  If, for example, you'd prefer to install
-into `/home/me/mystuff/lib`, `/home/me/mystuff/include`, and
-`/home/me/mystuff/bin`, you can tell `configure` about that with:
-
-```console
-./configure --prefix=/home/me/mystuff
-```
-
-Another interesting option is to enable 64-bit integer support for
-line and column numbers and the over-all byte index:
-
-```console
-./configure CPPFLAGS=-DXML_LARGE_SIZE
-```
-
-However, such a modification would be a breaking change to the ABI
-and is therefore not recommended for general use — e.g. as part of
-a Linux distribution — but rather for builds with special requirements.
-
-After running the configure script, the `make` command will build
-things and `make install` will install things into their proper
-location.  Have a look at the `Makefile` to learn about additional
-`make` options.  Note that you need to have write permission into
-the directories into which things will be installed.
-
-If you are interested in building Expat to provide document
-information in UTF-16 encoding rather than the default UTF-8, follow
-these instructions (after having run `make distclean`).
-Please note that we configure with `--without-xmlwf` as xmlwf does not
-support this mode of compilation (yet):
-
-1. Mass-patch `Makefile.am` files to use `libexpatw.la` for a library name:
-   <br/>
-   `find -name Makefile.am -exec sed
-       -e 's,libexpat\.la,libexpatw.la,'
-       -e 's,libexpat_la,libexpatw_la,'
-       -i {} +`
-
-1. Run `automake` to re-write `Makefile.in` files:<br/>
-   `automake`
-
-1. For UTF-16 output as unsigned short (and version/error strings as char),
-   run:<br/>
-   `./configure CPPFLAGS=-DXML_UNICODE --without-xmlwf`<br/>
-   For UTF-16 output as `wchar_t` (incl. version/error strings), run:<br/>
-   `./configure CFLAGS="-g -O2 -fshort-wchar" CPPFLAGS=-DXML_UNICODE_WCHAR_T
-       --without-xmlwf`
-   <br/>Note: The latter requires libc compiled with `-fshort-wchar`, as well.
-
-1. Run `make` (which excludes xmlwf).
-
-1. Run `make install` (again, excludes xmlwf).
-
-Using `DESTDIR` is supported.  It works as follows:
-
-```console
-make install DESTDIR=/path/to/image
-```
-
-overrides the in-makefile set `DESTDIR`, because variable-setting priority is
-
-1. commandline
-1. in-makefile
-1. environment
-
-Note: This only applies to the Expat library itself, building UTF-16 versions
-of xmlwf and the tests is currently not supported.
-
-When using Expat with a project using autoconf for configuration, you
-can use the probing macro in `conftools/expat.m4` to determine how to
-include Expat.  See the comments at the top of that file for more
-information.
-
-A reference manual is available in the file `doc/reference.html` in this
-distribution.
-
-
-The CMake build system is still *experimental* and will replace the primary
-build system based on GNU Autotools at some point when it is ready.
-For an idea of the available (non-advanced) options for building with CMake:
-
-```console
-# rm -f CMakeCache.txt ; cmake -D_EXPAT_HELP=ON -LH . | grep -B1 ':.*=' | sed 's,^--$,,'
-// Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel ...
-CMAKE_BUILD_TYPE:STRING=
-
-// Install path prefix, prepended onto install directories.
-CMAKE_INSTALL_PREFIX:PATH=/usr/local
-
-// Path to a program.
-DOCBOOK_TO_MAN:FILEPATH=/usr/bin/docbook2x-man
-
-// build man page for xmlwf
-EXPAT_BUILD_DOCS:BOOL=ON
-
-// build the examples for expat library
-EXPAT_BUILD_EXAMPLES:BOOL=ON
-
-// build fuzzers for the expat library
-EXPAT_BUILD_FUZZERS:BOOL=OFF
-
-// build the tests for expat library
-EXPAT_BUILD_TESTS:BOOL=ON
-
-// build the xmlwf tool for expat library
-EXPAT_BUILD_TOOLS:BOOL=ON
-
-// Character type to use (char|ushort|wchar_t) [default=char]
-EXPAT_CHAR_TYPE:STRING=char
-
-// install expat files in cmake install target
-EXPAT_ENABLE_INSTALL:BOOL=ON
-
-// Use /MT flag (static CRT) when compiling in MSVC
-EXPAT_MSVC_STATIC_CRT:BOOL=OFF
-
-// build a shared expat library
-EXPAT_SHARED_LIBS:BOOL=ON
-
-// Treat all compiler warnings as errors
-EXPAT_WARNINGS_AS_ERRORS:BOOL=OFF
-
-// Make use of getrandom function (ON|OFF|AUTO) [default=AUTO]
-EXPAT_WITH_GETRANDOM:STRING=AUTO
-
-// utilize libbsd (for arc4random_buf)
-EXPAT_WITH_LIBBSD:BOOL=OFF
-
-// Make use of syscall SYS_getrandom (ON|OFF|AUTO) [default=AUTO]
-EXPAT_WITH_SYS_GETRANDOM:STRING=AUTO
-```