add ability to build cross compiler

This patch is hardcoding /usr/TRIPLET/include for cross builds. Normally it is PF/TRIPLET/include but gcc-snapshot has PF != /usr so it does not work.

I think that this can be changed to:

ifeq (gcc-snapshot)
  debian_patches += cross-include-trunk.diff
else
  debian_patches += cross-include.diff
endif

way where attached patch would be used to create cross-include-trunk.diff

cause I would prefer to not hardcode it for all cases. Opinion?

This is patch against debian/patches/gcc-multiarch.diff from gcc-snapshot 20110813 - I hacked that patch to make gcc-linaro-armel-cross use /usr/TRIPLET/lib for target libraries.

20110914 has this patch totally rewritten and I did not looked yet how to get it working.

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GCC trunk moved unwind files from src/gcc to src/libgcc - cross-fixes-trunk.diff is a copy of cross-fixes.diff with those changes done

cross-include-trunk.diff hardcodes /usr/TRIPLET/include instead of (prefix)/TRIPLET/include

these patches should be applied now