cc/gcc: Apply CT_CC_GCC_DISABLE_PCH to do_cc_core.
Otherwise, users have to input --disable-libstdcxx-pch option
when building bare-metal CANADIAN C++ compiler.
Reviewed-by: Michael Hope
Signed-off-by: Zhenqiang Chen <zhenqiang.chen@linaro.org>
(transplanted from e3e1c9d45bddfbfb433ee9d583faf42fa31f50c0)
1 diff -durN gcc-4.2.1.orig/libstdc++-v3/include/c_std/std_cstdio.h gcc-4.2.1/libstdc++-v3/include/c_std/std_cstdio.h
2 --- gcc-4.2.1.orig/libstdc++-v3/include/c_std/std_cstdio.h 2006-12-07 10:33:51.000000000 +0100
3 +++ gcc-4.2.1/libstdc++-v3/include/c_std/std_cstdio.h 2007-08-03 20:33:24.000000000 +0200
9 +#if _GLIBCXX_USE_C99 || defined(__UCLIBC__)