win32: gdk3 resurrection

There are sure regressions but basic stuff seems to be working
again after all the API breakage done with comments like
"Win32 and Quartz need to be ported still."

gdk/win32/gdktestutils-win32.c

@@ -22,13 +22,8 @@
 #include <win32/gdkwin32.h>
 
 
-void
-gdk_test_render_sync (GdkWindow *window)
-{
-}
-
 gboolean
-gdk_test_simulate_key (GdkWindow      *window,
+_gdk_win32_window_simulate_key (GdkWindow      *window,
                        gint            x,
                        gint            y,
                        guint           keyval,
@@ -41,7 +36,7 @@ gdk_test_simulate_key (GdkWindow      *window,
 }
 
 gboolean
-gdk_test_simulate_button (GdkWindow      *window,
+_gdk_win32_window_simulate_button (GdkWindow      *window,
                           gint            x,
                           gint            y,
                           guint           button, /*1..3*/