perf: use the `perf--` prefix for perf command
This is the one command namespace where they should not be any ambiguity about
command that should be in it. The perf extensions is only adding performance
related command.
so this is a good ground to start putting dash folding to the tests.
Differential Revision: https://phab.mercurial-scm.org/D9516
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