[Bug libc/20054] gethostname not declared for XPG4

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https://sourceware.org/bugzilla/show_bug.cgi?id=20054

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=612fe4327577f9afaf6f45b400a737683eef9d0c

commit 612fe4327577f9afaf6f45b400a737683eef9d0c
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu May 12 16:50:43 2016 +0000

    Declare gethostname for XPG4 (bug 20054).

    unistd.h declares gethostname for __USE_UNIX98 || __USE_XOPEN2K.  But
    it's also in XPG4 (XNS volume - C438 - not the main definitions of
    system interfaces and headers in C435).  This patch corrects the
    condition.

    Tested for x86_64 and x86 (testsuite, and that installed stripped
    shared libraries are unchanged by the patch).

        [BZ #20054]
        * posix/unistd.h (gethostname): Declare if [__USE_XOPEN_EXTENDED],
        not [__USE_UNIX98].
        * conform/data/unistd.h-data (gethostname): Do not expect for
        [XPG3].

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

Summary of changes:
 ChangeLog                  |    6 ++++++
 conform/data/unistd.h-data |    2 +-
 posix/unistd.h             |    2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

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