* allow the user to specify a folder where files that can be sent
   via LOAD DATA LOCAL can exist
 * add mysqli.local_infile_directory for mysqli
   (ignored if mysqli.allow_local_infile is enabled)
 * add PDO::MYSQL_ATTR_LOCAL_INFILE_DIRECTORY for pdo_mysql
   (ignored if PDO::MYSQL_ATTR_LOCAL_INFILE is enabled)
 * add related tests
 * fixes for building with libmysql 8.x
 * small improvement in existing tests
 * update php.ini-[development|production] files

Closes GH-6448.

Co-authored-by: Nikita Popov <nikic@php.net>

* PHP-8.0:
  Add Windows support for OCI 19

As requested by Christopher Jones.

* PHP-7.4:
  Fix typos in php.ini files

Closes GH-6441.

[ci skip]

* PHP-7.4:
  Synchronize php.ini-development and php.ini-production

Closes GH-6231.

If we do not specify the exact version of the .NET framework to use,
the default CLR is loaded, which is typically CLR 2, which is very old.
Therefore, we introduce a `PHP_INI_SYSTEM` setting, which allows users
to choose the desired .NET framework version.  The value of the setting
are the first three parts of the framework's version number, separated
by dots, and prefixed with "v", e.g. "v4.0.30319".  If the value of the
INI setting is `NULL` (the default) or an empty string, the default CLR
is used.

Internally, we switch from the most generic `CoCreateInstance()` to
`CorBindToRuntime()` which is implemented in mscoree.dll.  To avoid the
hard dependency to that library, we load dynamically.

So this fix is supposed to be fully backwards compatible.

Closes GH-5949

We might just want to drop this completely, but at least don't
enable it by default. It already gets disabled by a number of
SAPIs, but we should make that the default state.