Allow building SDL on Windows without audio support

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40170

src/video/windib/SDL_dibvideo.c

@@ -286,7 +286,9 @@ int DIB_VideoInit(_THIS, SDL_PixelFormat *vformat)
 	if ( DIB_CreateWindow(this) < 0 ) {
 		return(-1);
 	}
+#ifndef DISABLE_AUDIO
 	DX5_SoundFocus(SDL_Window);
+#endif
 
 	/* Determine the screen depth */
 	vformat->BitsPerPixel = DIB_SussScreenDepth();

src/video/windx5/SDL_dx5video.c

@@ -876,7 +876,9 @@ int DX5_VideoInit(_THIS, SDL_PixelFormat *vformat)
 	if ( DX5_CreateWindow(this) < 0 ) {
 		return(-1);
 	}
+#ifndef DISABLE_AUDIO
 	DX5_SoundFocus(SDL_Window);
+#endif
 
 	/* Create the DirectDraw object */
 	result = DDrawCreate(NULL, &ddraw, NULL);