Introduce mg_calloc

src/util.c

@@ -199,3 +199,15 @@ void mg_delayms(unsigned int ms) {
   uint64_t to = mg_millis() + ms + 1;
   while (mg_millis() < to) (void) 0;
 }
+
+
+#if MG_ENABLE_CUSTOM_CALLOC
+#else
+void *mg_calloc(size_t count, size_t size) {
+  return calloc(count, size);
+}
+
+void mg_free(void *ptr) {
+  free(ptr);
+}
+#endif