QMetaType: only use sized-delete when available

Sized-delete is C++14 feature, but Clang didn't enable it until version
19.1 because it needs to support different standard libraries, and many
of them hadn't implemented support when the code was originally written.

https://github.com/llvm/llvm-project/pull/83774

Amends 44b5602536a95b847404b28948ad2bb4a4076f4b.

Change-Id: I17fc098d70bfb7474f4324d29ec6f32c91e3a705
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qmetatype.cpp

@@ -77,9 +77,17 @@ struct QMetaTypeDeleter
     void operator()(void *data) const
     {
         if (iface->alignment > __STDCPP_DEFAULT_NEW_ALIGNMENT__) {
+#ifdef __cpp_sized_deallocation
             operator delete(data, iface->size, std::align_val_t(iface->alignment));
+#else
+            operator delete(data, std::align_val_t(iface->alignment));
+#endif
         } else {
+#ifdef __cpp_sized_deallocation
             operator delete(data, iface->size);
+#else
+            operator delete(data);
+#endif
         }
     }
 };