Fix a new warning

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> But what's the best way to fix the second?  __pthread_clock_gettime is
> used only as weak declaration in sysdeps/unix/i386/i586/clock_gettime.c.

Put it in the same header.  It's just fine and I assume other
architectures will follow the same scheme.

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