Add CreatePixmap allocation hints.

These hints allow an acceleration architecture to optimize allocation of certain
types of pixmaps, such as pixmaps that will serve as backing pixmaps for
redirected windows.

hw/dmx/dmxpixmap.c

@@ -81,7 +81,8 @@ void dmxBECreatePixmap(PixmapPtr pPixmap)
 
 /** Create a pixmap for \a pScreen with the specified \a width, \a
  *  height, and \a depth. */
-PixmapPtr dmxCreatePixmap(ScreenPtr pScreen, int width, int height, int depth)
+PixmapPtr dmxCreatePixmap(ScreenPtr pScreen, int width, int height, int depth,
+			  unsigned usage_hint)
 {
     DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
     PixmapPtr      pPixmap;