[ct-ng] mingw32 sysroot

[Esben Haabendal]

Hi

I am using the attached patch to be able to use crosstool-ng 1.8.0 to
build mingw32 cross compiler (gcc 4.5.1) with sysroot enabled.

The change in gcc.sh is rather ugly, I must admit, but it was so much
simpler to fix it here than in gcc, and saves me the trouble of having
to fixup all gcc versions. I believe the mingw/include behavior is
pretty much stable across gcc versions.

The changes to use CT_HEADERS_DIR instead of CT_SYSROOT_DIR/include as
header destination seems pretty obvious and clean to me, so I suggest
that something like this is applied.

I have not tested if this breaks non-sysroot builds, so if someone
caring for mingw32 would do that it would be nice.

P.S. Building i586-mingw32 -> powerpc-linux-gnu canadian cross compiler
with 3 times ct-ng builds using gcc-4.5.1 is pretty neat :-)

/Esben
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