Add the missing function required for -win.

They're just stubs for now, but nq-win.exe and qw-client-win.exe build. I'm
99.999% certain they won't work, though :P

libs/video/targets/vid_win.c

@@ -470,7 +470,6 @@ VID_Init (byte *palette, byte *colormap)
 
 	vid_fullscreen = Cvar_Get ("vid_fullscreen", "0", CVAR_ROM | CVAR_ARCHIVE,
 							   NULL, "Run WGL client at fullscreen");
-	GLF_Init ();
 
 	memset (&win_gdevmode, 0, sizeof (win_gdevmode));
 
@@ -618,6 +617,22 @@ VID_SetGamma (double gamma)
 	return i;
 }
 
+void
+VID_LockBuffer (void)
+{
+}
+
+void
+VID_UnlockBuffer (void)
+{
+}
+
+void
+VID_Update (vrect_t *rects)
+{
+	//FIXME sw
+}
+
 #if 0
 static void
 VID_SaveGamma (void)