perkeep/lib/go/camli/third_party

External packages which Camlistore depends on.

These are not under Camlistore copyright/license.  See the respective projects
for their copyright & licensing details.

These are mirrored into Camlistore for hermetic build reasons, as well
as enabling local patching to work with an ever-changing upstream Go
project.  (not all projects will follow Go tip as closely)