cmake HAVE_EXPLICIT_MEMSET examples

nih-at/libzip CMakeLists.txt :122 

check_function_exists(explicit_memset HAVE_EXPLICIT_MEMSET)

flyinghead/flycast core/deps/libzip/CMakeLists.txt :111 

check_function_exists(explicit_memset HAVE_EXPLICIT_MEMSET)

ggarra13/mrv2 tlRender/etc/SuperBuild/patches/Libssh2-patch/CMakeLists.txt :231 

check_symbol_exists(explicit_memset string.h HAVE_EXPLICIT_MEMSET)