Update SDL_metal.inc to 3.4.4

Author: Free-Pascal-meets-SDL-Website

units/SDL3.pas

@@ -121,7 +121,7 @@ interface
 {$I SDL_filesystem.inc}                   // 3.4.4
 {$I SDL_atomic.inc}                       // 3.4.4
 {$I SDL_hidapi.inc}                       // 3.4.4
-{$I SDL_metal.inc}                        // 3.2.0
+{$I SDL_metal.inc}                        // 3.4.4
 {$I SDL_vulkan.inc}                       // 3.2.0
 {$I SDL_thread.inc}                       // 3.2.0
 {$I SDL_process.inc}                      // 3.2.0

units/SDL_metal.inc

@@ -43,6 +43,8 @@ type
  * \param window the window.
  * \returns handle NSView or UIView.
  *
+ * \threadsafety This function should only be called on the main thread.
+ *
  * \since This function is available since SDL 3.2.0.
  *
  * \sa SDL_Metal_DestroyView
@@ -59,6 +61,8 @@ function SDL_Metal_CreateView(window: PSDL_Window): TSDL_MetalView; cdecl;
  *
  * \param view the SDL_MetalView object.
  *
+ * \threadsafety This function should only be called on the main thread.
+ *
  * \since This function is available since SDL 3.2.0.
  *
  * \sa SDL_Metal_CreateView
@@ -72,6 +76,8 @@ procedure SDL_Metal_DestroyView(view: TSDL_MetalView); cdecl;
  * \param view the SDL_MetalView object.
  * \returns a Pointer.
  *
+ * \threadsafety This function should only be called on the main thread.
+ *
  * \since This function is available since SDL 3.2.0.
   }
 function SDL_Metal_GetLayer(view: TSDL_MetalView): Pointer; cdecl;