Silence delete compile warning in memory.h/cpp on Windows

include/godot_cpp/core/memory.hpp

@@ -44,6 +44,14 @@ _ALWAYS_INLINE_ void *operator new(size_t p_size, void *p_pointer, size_t check,
 	return p_pointer;
 }
 
+#ifdef _MSC_VER
+// When compiling with VC++ 2017, the above declarations of placement new generate many irrelevant warnings (C4291).
+// The purpose of the following definitions is to muffle these warnings, not to provide a usable implementation of placement delete.
+void operator delete(void *p_mem, const char *p_description);
+void operator delete(void *p_mem, void *(*p_allocfunc)(size_t p_size));
+void operator delete(void *p_mem, void *p_pointer, size_t check, const char *p_description);
+#endif
+
 namespace godot {
 
 class Memory {