Fix siginterrupt namespace (bug 21597)

[Andreas Schwab]

On Jun 14 2017, Joseph Myers <joseph@codesourcery.com> wrote:

> 	[BZ #21597]
> 	* signal/signal.h (siginterrupt): Make declaration conditional on
> 	[__USE_XOPEN_EXTENDED || __USE_MISC].

Ok.

Andreas.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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