glibc-tests: Pin compiler to gcc
glibc-tests: Pin compiler to gcc

glibc is not yet compilable for clang
and glibc-tests is driven out of glibc sources in essense

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang