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>

dix/pixmap.c

@@ -113,7 +113,7 @@ AllocatePixmap(ScreenPtr pScreen, int pixDataSize)
     if (pScreen->totalPixmapSize > ((size_t)-1) - pixDataSize)
 	return NullPixmap;
     
-    pPixmap = xalloc(pScreen->totalPixmapSize + pixDataSize);
+    pPixmap = malloc(pScreen->totalPixmapSize + pixDataSize);
     if (!pPixmap)
 	return NullPixmap;