ltp: remove unused rusers.h

This cherry-picks an upstream commit to make it build with
glibc 2.27 on ARM.

commit 5dc1397f236f55cb56d4f510022a69dca8b58324
Author: Erico Nunes <nunes.erico@gmail.com>
Date:   Thu Feb 16 12:10:38 2017 +0100

    rusers.h is unused and not available for uClibc-ng / libtirpc

    Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
    Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
    Signed-off-by: Petr Vorel <pvorel@suse.cz>

BUG=chromium:864587
TEST=emerge-kevin autotest-deps-ltp passes with glibc 2.27.

Change-Id: Ia2ee787a276d455d1532827146056cf1da4ad0e1
Reviewed-on: https://chromium-review.googlesource.com/1141068
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
11 files changed