cmake HAVE__WRITEEFLAGS_GCC examples

TheAssemblyArmada/Thyme deps/baseconfig/cmake/CheckIntrinsics.cmake :26 

check_c_source_compiles("
        #include <x86intrin.h>
        int main() {
            unsigned tmp = 0x00200000;
            __writeeflags(tmp);      
            return 0;
        }" HAVE__WRITEEFLAGS_GCC)