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>

hw/xwin/winconfig.c

@@ -393,10 +393,10 @@ winConfigKeyboard (DeviceIntPtr pDevice)
                   (1000 / g_winInfo.keyboard.rate) < 1) 
             {
               winErrorFVerb (2, "\"%s\" is not a valid AutoRepeat value", s);
-              xfree(s);
+              free(s);
               return FALSE;
             }
-          xfree(s);
+          free(s);
           winMsg (X_CONFIG, "AutoRepeat: %ld %ld\n", 
                   g_winInfo.keyboard.delay, g_winInfo.keyboard.rate);
         }