Tweak suppressions file slightly to work with valgrind 3.7.0

Refs #3547
Merge commit 'b67edf0d398a35afbf836c76e9115eb4f6b396d1'
No spinning
refs #3752
Fixed unused variables.  Fixes #3749.

One of the unused variables was actually a bug... ooops
Merge pull request #3755 from WilkAndy/unused_3749

Fixed unused variables.  Fixes #3749.
Merge commit '22d5345304d0e0b913c16e3f688a1ebf7712b057'
Merge pull request #3753 from permcody/dmake

No spinning
Merge commit 'ec23378edeaeb7374271d9330230539a491cb7b0'