Enable sys_stat() on BGQ.


git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_8_BRANCH_BGQ@14224 a5019735-40e9-0310-863c-91ae7b9d1cf9
Don't disable error reporting in the wrapper for MPI_Abort, since
doing so causes the calling thread to exit with error reporting
disabled, and the core complains -- correctly but confusingly -- about
that.



git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_8_BRANCH_BGQ@14226 a5019735-40e9-0310-863c-91ae7b9d1cf9