Declare gethostname for XPG4 (bug 20054)

[Mike Frysinger]

On 06 May 2016 15:38, Joseph Myers wrote:
> 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.

OK
-mike
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