[testsuite] Fix gcc.dg/torture/pr47917.c on IRIX 6.5

[Eric Botcazou]

> The new gcc.dg/torture/pr47917.c test currently fails the execution test
> on IRIX 6.5.  To get a C99-conformant snprintf, one needs to include
> <stdio.h> with _XOPEN_SOURCE defined as 500.  The following patch does
> this.

Likewise on Solaris 8 (It's deprecated, I know, but I have access to a quite 
fast SPARC/Solaris 8 machine).

Tested on sparc-sun-solaris2.8, applied on the mainline.


2011-04-05  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc.dg/torture/pr47917.c: Add -D_XOPEN_SOURCE=500 to dg-options for
	Solaris 8 as well.


-- 
Eric Botcazou
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