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[patch] Fix PR/41943 include search path composition is bogus for *-*-mingw32 targets

Hello,

this patch prevents for DOS based systems, that the sysroot gets add
to a prefix, which has already an absolute path with drive-letter.
This fixes the native build of *-*-mingw32 relocatable toolchains
using --prefix and --with-sysroot. This patch doesn't change behavior
for *nix based OSes.

ChangeLog

2009-12-06  Kai Tietz  <kai.tietz@onevision.com>

	* gcc.c (add_sysrooted_prefix): Don't add sysroot to prefix
	with DOS drive-letter.

Tested this for i686-pc-mingw32 and for (i686|x86_64)-w64-mingw32. Ok for apply?

Cheers,
Kai

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