cmake LWS_HAVE_MALLOC_USABLE_SIZE examples

warmcat/libwebsockets CMakeLists.txt :634 

CHECK_C_SOURCE_COMPILES(
	"#include <malloc.h>
	int main(int argc, char **argv) { return (int)malloc_usable_size((void *)0); }
	" LWS_HAVE_MALLOC_USABLE_SIZE)

c-jimenez/open-ocpp 3rdparty/libwebsockets/CMakeLists.txt :562 

CHECK_C_SOURCE_COMPILES(
	"#include <malloc.h>
	int main(int argc, char **argv) { return (int)malloc_usable_size((void *)0); }
	" LWS_HAVE_MALLOC_USABLE_SIZE)

fluffos/fluffos src/thirdparty/libwebsockets/CMakeLists.txt :545 

CHECK_C_SOURCE_COMPILES(
	"#include <malloc.h>
	int main(int argc, char **argv) { return (int)malloc_usable_size((void *)0); }
	" LWS_HAVE_MALLOC_USABLE_SIZE)