Use std type traits instead of intrinsics

This removes warnings and mimics what has been done in Godot itself.

include/godot_cpp/core/memory.hpp

@@ -108,7 +108,7 @@ public:
 
 template <class T>
 void memdelete(T *p_class, typename std::enable_if<!std::is_base_of_v<godot::Wrapped, T>>::type * = nullptr) {
-	if (!__has_trivial_destructor(T)) {
+	if (!std::is_trivially_destructible<T>::value) {
 		p_class->~T();
 	}
 
@@ -122,7 +122,7 @@ void memdelete(T *p_class) {
 
 template <class T, class A>
 void memdelete_allocator(T *p_class) {
-	if (!__has_trivial_destructor(T)) {
+	if (!std::is_trivially_destructible<T>::value) {
 		p_class->~T();
 	}
 
@@ -145,7 +145,7 @@ T *memnew_arr_template(size_t p_elements, const char *p_descr = "") {
 	ERR_FAIL_COND_V(!mem, failptr);
 	*(mem - 1) = p_elements;
 
-	if (!__has_trivial_constructor(T)) {
+	if (!std::is_trivially_destructible<T>::value) {
 		T *elems = (T *)mem;
 
 		/* call operator new */
@@ -161,7 +161,7 @@ template <typename T>
 void memdelete_arr(T *p_class) {
 	uint64_t *ptr = (uint64_t *)p_class;
 
-	if (!__has_trivial_destructor(T)) {
+	if (!std::is_trivially_destructible<T>::value) {
 		uint64_t elem_count = *(ptr - 1);
 
 		for (uint64_t i = 0; i < elem_count; i++) {