contrib/python-zstandard/MANIFEST.in

rust-index: use the new method in shortesthexnodeidprefix

This code can now run with both a Rust or a C index.

Differential Revision: https://phab.mercurial-scm.org/D7659

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