Log Message:
cross/arm-none-eabi-gcc: fix build with libc++

Building gcc against libc++, e.g., with clang, poisons the ctype
macros due to including safe-ctype.h before including C++ standard
headers such as <list>, <map>, etc.  The fix is to include the
standard headers first.

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111632