[Author: dmaclach]
[Author: dmaclach]

Turn off leak testing on platforms that don't support it well.
Added new system leak to the exclusion list.

R=thomasvl
DELTA=4  (3 added, 0 deleted, 1 changed)
qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac