cmake LIBOMP_HAVE_WNO_SWITCH_FLAG examples

llvm-mirror/openmp runtime/cmake/config-ix.cmake :57 

check_cxx_compiler_flag(-Wno-switch LIBOMP_HAVE_WNO_SWITCH_FLAG)

INET-RC/GeoMX 3rdparty/openmp/runtime/cmake/config-ix.cmake :59 

check_c_compiler_flag(-Wswitch LIBOMP_HAVE_WNO_SWITCH_FLAG)