mercurial/cext/mpatch.pyi

makefile: add a install-chg option

This is done as a gratuitous improvement on the way to add makefile entry to
build and install rhg.

It seems saner to have equivalent entry for chg too.

Differential Revision: https://phab.mercurial-scm.org/D10192

from typing import (
    List,
)

version: int

class mpatchError(Exception): ...

def patches(text: bytes, bins: List[bytes]) -> bytes: ...
def patchedsize(orig: int, data: bytes) -> int: ...