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 --- gcc-4.1.2.orig/libstdc++-v3/include/c_std/std_cstdio.h 2005-10-30 23:21:50.000000000 +0100
2 +++ gcc-4.1.2/libstdc++-v3/include/c_std/std_cstdio.h 2007-03-04 23:33:27.000000000 +0100
8 +#if _GLIBCXX_USE_C99 || defined(__UCLIBC__)