Updates DimmWitted submodule to be Jenkins friendly
Updates DimmWitted submodule to be Jenkins friendly

so jobs updating GitHub release binaries for Mac don't fail.

Fixes #512

HazyResearch/deepdive,shahin/deepdive,HazyResearch/deepdive,sky-xu/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,shahin/deepdive,sky-xu/deepdive