cmake LWS_HAVE_EXECVPE examples

warmcat/libwebsockets CMakeLists.txt :651 

CHECK_FUNCTION_EXISTS(execvpe LWS_HAVE_EXECVPE)

c-jimenez/open-ocpp 3rdparty/libwebsockets/CMakeLists.txt :575 

CHECK_FUNCTION_EXISTS(execvpe LWS_HAVE_EXECVPE)

fluffos/fluffos src/thirdparty/libwebsockets/CMakeLists.txt :558 

CHECK_FUNCTION_EXISTS(execvpe LWS_HAVE_EXECVPE)