uclibc: fix build without LARGEFILE for xtensa

The default uClibc version for xtensa is broken when LARGEFILE is disabled.
Add a patch to fix this.

Reported-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>