Automatically reformat com32/include/klibc/endian.h using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Automatically reformat com32/include/klibc/diverr.h using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Automatically reformat com32/include/klibc/archsetjmp.h using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

- Constructed data objects can't be common.  Earlier version of
  gcc didn't if the objects were explicitly listed extern, but
  newer ones need an explicit __attribute__((nocommon)) or
  -fno-common.

- Make syslinux_derivative_info() save the entire reply.

Add a macro for weak symbols.

__likely() and __unlikely() should explicitly booleanize their
arguments.

Add macros __aligned() (which takes a byte count), and __alignas()
(which takes a type or expression whose type is used, same as sizeof).

A bunch of glibc header files were bogusly included.  We should not
depend on having a 32-bit glibc installed, since we don't use it.

Beginnings of higher-level functions for PXE support.  For now, only
pxe_get_cached_info() is actually supported.