gcc/Makefile's install rules ordinarily look at the
installed include directory for a limits.h to decide
whether the lib/gcc/.../include-fixed/limits.h header
should be made to expect a libc-supplied limits.h or not.
Since we're doing this build in a clean environment without
any libc installed, we need to force its hand here.
This patch is taken from chromium.org
https://src.chromium.org/viewvc/native_client/trunk/src/native_client/toolchain_build/toolchain_build.py?r1=10387&r2=10386&pathrev=10387
Original patch description:
gcc/Makefile's install rules ordinarily look at the installed include directory for a limits.h to decide whether the lib/gcc/.../include-fixed/limits.h header should be made to expect a libc-supplied limits.h or not. Since we're doing this build in a clean environment without any libc installed, we need to force its hand here.