PATCH: dg-require-{fork,mkfifo} for V3 testsuite

[Mark Mitchell]

Benjamin Kosnik wrote:
>>This patch adds dg-require-fork and dg-require-mkfifo to the generic
>>GCC test infrastructure, and then uses it in the V3 testsuite, instead
>>of using "try_mkfifo" and blindly calling "fork", even on systems that
>>don't support it.
> 
> 
> This looks great to me.

Thanks, checked in on mainline.  I'll be doing 4.0 and 3.4 backports, 
wehn I get a chance.

-- 
Mark Mitchell
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