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>

Xi/extinit.c

@@ -1156,7 +1156,7 @@ void
 AssignTypeAndName(DeviceIntPtr dev, Atom type, char *name)
 {
     dev->xinput_type = type;
-    dev->name = (char *)xalloc(strlen(name) + 1);
+    dev->name = (char *)malloc(strlen(name) + 1);
     strcpy(dev->name, name);
 }