run-tests: ensure that --no-rust do not use rust
Since having a valid value in HGWITHRUSTEXT is enough to trigger the use of
rust, we need to unset it before install to be sure.
from typing import (
List,
Tuple,
)
version: int
def bdiff(a: bytes, b: bytes) -> bytes: ...
def blocks(a: bytes, b: bytes) -> List[Tuple[int, int, int, int]]: ...
def fixws(s: bytes, allws: bool) -> bytes: ...
def splitnewlines(text: bytes) -> List[bytes]: ...
def xdiffblocks(a: bytes, b: bytes) -> List[Tuple[int, int, int, int]]: ...