cmake HAVE_WNO_CXX20_EXT examples

dpjudas/SurrealEngine Thirdparty/openal-soft/CMakeLists.txt :275 

check_cxx_compiler_flag(-Wno-c++20-extensions HAVE_WNO_CXX20_EXT)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/doom3/neo/externlibs/openal-soft/CMakeLists.txt :276 

check_cxx_compiler_flag(-Wno-c++20-extensions HAVE_WNO_CXX20_EXT)

axmolengine/axmol 3rdparty/openal/CMakeLists.txt :293 

check_cxx_compiler_flag(-Wno-c++20-extensions HAVE_WNO_CXX20_EXT)