Replace X-allocation functions with their C89 counterparts

The only remaining X-functions used in server are XNF*, the rest is converted to
plain alloc/calloc/realloc/free/strdup.

X* functions are still exported from server and x* macros are still defined in
header file, so both ABI and API are not affected by this change.

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

mi/miscrinit.c

@@ -166,7 +166,7 @@ miCreateScreenResources(ScreenPtr pScreen)
     {
 	value = pScrInitParms->pbits;
     }
-    xfree(pScreen->devPrivate); /* freeing miScreenInitParmsRec */
+    free(pScreen->devPrivate); /* freeing miScreenInitParmsRec */
     pScreen->devPrivate = value; /* pPixmap or pbits */
     return TRUE;
 }
@@ -180,7 +180,7 @@ miScreenDevPrivateInit(ScreenPtr pScreen, int width, pointer pbits)
      * to the screen, until CreateScreenResources can put them in the
      * screen pixmap.
      */
-    pScrInitParms = xalloc(sizeof(miScreenInitParmsRec));
+    pScrInitParms = malloc(sizeof(miScreenInitParmsRec));
     if (!pScrInitParms)
 	return FALSE;
     pScrInitParms->pbits = pbits;