drd/tests/atomic_var: Avoid that platform-specific code can trigger a false negative

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13876 a5019735-40e9-0310-863c-91ae7b9d1cf9
drd: Fix pthread_rwlock_timed{rd,wr}lock intercepts (#332263)

From: Ivo Raisr <ivosh@ivosh.net>


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13877 a5019735-40e9-0310-863c-91ae7b9d1cf9