libsecret ships headers from valgrind, but they seem to come from an old
version. Update to the headers from valgrind-3.11.0-1.fc23.x86_64
in order to get VG_DO_ADDED_LEAK_CHECK definition.
https://bugzilla.gnome.org/show_bug.cgi?id=756766
* Cleanup secure memory allocator for valgrind.
* Bring valgrind headers in.
* Add lots of suppressions for glib, gdbus, gcrypt
* Fix up a bunch of bugs where things weren't getting freed
* Add new 'make check-memory' target