Correcting sys_shmdt wrapper for MIPS Linux.

This patch fixes incorrect handling of sys_shmdt for MIPS. Linux wrappers have
been added for sys_sigprocmask, sys_timerfd_create, sys_timerfd_gettime, and
sys_timerfd_settime on MIPS.
The bug has been reported at https://bugs.kde.org/show_bug.cgi?id=270777 as
sh_mat issue, and it can be reproduced with shmat-sample.c from 
https://bugs.kde.org/show_bug.cgi?id=222545.
The change also fixes sigprocmask from memcheck tests.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12658 a5019735-40e9-0310-863c-91ae7b9d1cf9
2 files changed