cmake HAVE__STRDUP examples

NauEngine/NauEditorPublic editor/external/libzipconfig/CMakeLists.txt :103 

check_function_exists(_strdup HAVE__STRDUP)

nih-at/libzip CMakeLists.txt :114 

check_function_exists(_strdup HAVE__STRDUP)

flyinghead/flycast core/deps/libzip/CMakeLists.txt :103 

check_function_exists(_strdup HAVE__STRDUP)