[patch] Fix MIPS pipe, brk

[Steven J. Hill]

Joakim Tjernlund wrote:
> 
> Better check if its really hidden on MIPS. I think sjhill undid that for NPTL.
>
I did, but I just imported the assembly version from glibc, tested it
and it works. Everything for this change in the NPTL branch was done
under Revision 13090. Have a look and if it is acceptable, then I will
merge the changes into the trunk.

-Steve