cmake LWS_HAVE__VSNPRINTF examples

warmcat/libwebsockets CMakeLists.txt :655 

CHECK_FUNCTION_EXISTS(_vsnprintf LWS_HAVE__VSNPRINTF)

c-jimenez/open-ocpp 3rdparty/libwebsockets/CMakeLists.txt :579 

CHECK_FUNCTION_EXISTS(_vsnprintf LWS_HAVE__VSNPRINTF)

fluffos/fluffos src/thirdparty/libwebsockets/CMakeLists.txt :562 

CHECK_FUNCTION_EXISTS(_vsnprintf LWS_HAVE__VSNPRINTF)