[PATCH] Add IRIX support for -pthread

[Eric Christopher]

>
> Ok for mainline?
>
>
>
> 2006-06-20  Roger Sayle  <roger@eyesopen.com>
>
> 	* config/mips/iris6.h (LIB_SPEC): Add support for -pthread.
> 	(SUBTARGET_CPP_SPEC): Define _REENTERANT if -pthread specified.
>

OK.

-eric