localedef: fix xlocale.h related compile failure

Add upstream patch 'Don't include <xlocale.h>'.

Fixes Bug-10501 ([1]):

In file included from ./include/locale.h:1:0,
                 from /usr/include/libintl.h:103,
                 from ./include/libintl.h:2,
                 from glibc/locale/programs/charmap.c:25:
glibc/locale/locale.h:146:11: fatal error: xlocale.h: No such file or directory
 # include <xlocale.h>

[1] https://bugs.busybox.net/show_bug.cgi?id=10501



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