After libdispatch PR#49 gets merged, it would be feasible to start
including libdispatch in the linux buildbot presets and thus (I think) in
the development snapshots as well.
The additional libdispatch pre-reqs (libblocksruntime-dev
libkqueue-dev systemtap-sdt-dev autoconf libtool) would need to be
installed on the build machines.
Because libpwq is being included as a gitsubmodule, there are extra
steps after cloning swift-corelibs-libdispatch (git submodule init; git
submodule update) that the automated build would need to do.
Is there anything I can do to help move this along? Anything I've