uclibc: fix ARC compile

uclibc: fix ARC compile

Add patch [1,2] to fix ARC uclibc snapshot compile (as suggested by
Baruch Siach [3]).

Fixes ARC uclibc compile failure ([4]) posix_fadvise/off64_t related.

[1] http://thread.gmane.org/gmane.comp.lib.uclibc.general/23714
[2] http://patchwork.ozlabs.org/patch/308533/mbox/
[3] http://lists.busybox.net/pipermail/buildroot/2014-March/092512.html
[4] http://lists.busybox.net/pipermail/buildroot/2014-March/092506.html

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>