opengl32: Consistently use RtlSetLastWin32Error() everywhere.

dlls/opengl32/unix_private.h

@@ -45,7 +45,7 @@ extern struct opengl_funcs null_opengl_funcs DECLSPEC_HIDDEN;
 static inline struct opengl_funcs *get_dc_funcs( HDC hdc )
 {
     struct opengl_funcs *funcs = __wine_get_wgl_driver( hdc, WINE_WGL_DRIVER_VERSION );
-    if (!funcs) SetLastError( ERROR_INVALID_HANDLE );
+    if (!funcs) RtlSetLastWin32Error( ERROR_INVALID_HANDLE );
     else if (funcs == (void *)-1) funcs = &null_opengl_funcs;
     return funcs;
 }