cmake LWS_HAVE_GETENV examples

warmcat/libwebsockets CMakeLists.txt :644 

CHECK_FUNCTION_EXISTS(getenv LWS_HAVE_GETENV)

c-jimenez/open-ocpp 3rdparty/libwebsockets/CMakeLists.txt :568 

CHECK_FUNCTION_EXISTS(getenv LWS_HAVE_GETENV)

fluffos/fluffos src/thirdparty/libwebsockets/CMakeLists.txt :551 

CHECK_FUNCTION_EXISTS(getenv LWS_HAVE_GETENV)