compiler.h: only use inx/outx on ARM with glibc
musl only implements inx/outx on x86, so check for __GLIBC__ instead of __linux__. Signed-off-by: Ross Burton <ross.burton@intel.com>
musl only implements inx/outx on x86, so check for __GLIBC__ instead of __linux__. Signed-off-by: Ross Burton <ross.burton@intel.com>