[PATCH][ld] Implement --build-id=uuid on MinGW/MSYS2.

[Igor Kudrin]

Hi,

This patch adds support for the --build-id=uuid option on Windows
when ld is build in MSYS2 (MinGW) environment. It uses function
UuidCreate() from rpcrt4.dll instead of reading from /dev/urandom,
because the latter is not random enough in that case.

BTW, without the patch, using this option leads to AV.

Best regards,
Igor Kudrin

---
ld/ChangeLog

	* ldbuildid.c [__MINGW32__]: Include windows.h and rpcdce.h.
	(validate_build_id_style) [__MINGW32__]: Allow "uuid" style.
	(generate_build_id) [__MINGW32__]: Fill id_bits using UuidCreate().
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