contrib/python-zstandard/MANIFEST.in

bundlerepo: pass create=True

I don't want to know how this came to be. Maybe a holdover from the
days before Python had a bool type?

Differential Revision: https://phab.mercurial-scm.org/D4553

graft c-ext
graft zstd
graft tests
include make_cffi.py
include setup_zstd.py
include zstd.c
include LICENSE