[Bug libc/21244] support resolv_test_start() socket fd close should be checked for errors.

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https://sourceware.org/bugzilla/show_bug.cgi?id=21244

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ed3ea040bae8ef2cf131081124a1248a9fd3dca9

commit ed3ea040bae8ef2cf131081124a1248a9fd3dca9
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Mar 15 13:13:58 2017 +0100

    support: Add error checking to close system calls [BZ #21244]

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                     |   13 +++++++++++++
 support/Makefile                              |    1 +
 support/resolv_test.c                         |   23 ++++++++++++-----------
 support/support_enter_network_namespace.c     |    5 +++--
 support/support_run_diff.c                    |    4 ++--
 support/{xpthread_attr_destroy.c => xclose.c} |   12 +++++++-----
 support/xunistd.h                             |    4 ++++
 7 files changed, 42 insertions(+), 20 deletions(-)
 copy support/{xpthread_attr_destroy.c => xclose.c} (78%)

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