Fix Clang deprecated builtins

It seems that Clang and GCC have different interpretations of certain builtins. So this PR uses std <type_traits> functions just as cowdata.h does in the godot project.

Author: adamscott

include/godot_cpp/templates/cowdata.hpp

@@ -39,6 +39,7 @@
 
 #include <cstring>
 #include <new>
+#include <type_traits>
 
 namespace godot {
 
@@ -210,9 +211,9 @@ void CowData<T>::_unref(void *p_data) {
 if (refc->decrement() > 0) {
 return; // still in use
 }
-// clean up
 
-if (!__has_trivial_destructor(T)) {
+// clean up
+if (std::is_trivially_destructible<T>()) {
 uint32_t *count = _get_size();
 T *data = (T *)(count + 1);
 
@@ -247,7 +248,7 @@ uint32_t CowData<T>::_copy_on_write() {
 T *_data = (T *)(mem_new);
 
 // initialize new elements
-if (__has_trivial_copy(T)) {
+if (std::is_trivially_copyable<T>::value) {
 memcpy(mem_new, _ptr, current_size * sizeof(T));
 
 } else {
@@ -310,7 +311,7 @@ Error CowData<T>::resize(int p_size) {
 
 // construct the newly created elements
 
-if (!__has_trivial_constructor(T)) {
+if (!std::is_trivially_constructible<T>::value) {
 T *elems = _get_data();
 
 for (int i = *_get_size(); i < p_size; i++) {
@@ -321,7 +322,7 @@ Error CowData<T>::resize(int p_size) {
 *_get_size() = p_size;
 
 } else if (p_size < current_size) {
-if (!__has_trivial_destructor(T)) {
+if (!std::is_trivially_destructible<T>::value) {
 // deinitialize no longer needed elements
 for (uint32_t i = p_size; i < *_get_size(); i++) {
 T *t = &_get_data()[i];