cmake LIBOMP_HAVE___THREAD examples

Lewuathe/mlir-hello thirdparty/llvm-project/openmp/runtime/cmake/config-ix.cmake :261 

check_c_source_compiles(
     "__thread int x;
     int main(int argc, char** argv)
     { x = argc; return x; }"
     LIBOMP_HAVE___THREAD)

llvm-mirror/openmp runtime/cmake/config-ix.cmake :187 

check_c_source_compiles(
     "__thread int x;
     int main(int argc, char** argv)
     { x = argc; return x; }"
     LIBOMP_HAVE___THREAD)

INET-RC/GeoMX 3rdparty/openmp/runtime/cmake/config-ix.cmake :196 

check_c_source_compiles(
     "__thread int x;
     int main(int argc, char** argv)
     { x = argc; return x; }"
     LIBOMP_HAVE___THREAD)