- Fix helgrind/tests/tc18_semabuse.c on glibc 2.7 (RedHat 8).
- Fixed a glibc 2.7 specific assertion failure in exp-drd, namely one
that was triggered when sem_post()'s return value is not zero.
- exp-drd/test/matinv.c compiles now also on RedHat 7.3.
Note: more work will be required to get exp-drd working correctly on
RedHat 7.3.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7354
994193f9bb