cmake LIBCXXABI_HAS_GCC_LIB examples

Lewuathe/mlir-hello thirdparty/llvm-project/libcxxabi/cmake/config-ix.cmake :10 

check_library_exists(gcc __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_LIB)

Lewuathe/mlir-hello thirdparty/llvm-project/libcxxabi/cmake/config-ix.cmake :13 

check_library_exists(gcc __aeabi_uldivmod "" LIBCXXABI_HAS_GCC_LIB)