Summary:
cdatapack depends on clib, so let's move it to lib/ outside of fb-hgext.
None of the consumers of these files were changed. They will be changed as they
are moved into the main part of the repo.
Test Plan: hg purge --all && make local && cd tests && ./run-tests.py -S -j 48
Reviewers: mitrandir, #mercurial
Reviewed By: mitrandir
Differential Revision: https://phabricator.intern.facebook.com/D6677197
Signature: 6677197:1515447873:399fb3e7beb5cc1ad8db18f42b359ffbfbeb21f2