pyoxidizer: force pip to not use pep517 in order to be able to install hg
Mercurial is not (yet) a pep517 package, but the presence of a pyproject.toml
file tells newer-ish versions of pip that it should be one.
This is related to 58fe6d127a01, and fixes pyoxidizer builds for the Heptapod
CI.
Differential Revision: https://phab.mercurial-scm.org/D11710
$ cat >> $HGRCPATH << EOF
> [command-templates]
> log="{rev}:{node|short} ({phase}) [{tags} {bookmarks}] {desc|firstline}\n"
> [extensions]
> dirstateparanoidcheck = $TESTDIR/../contrib/dirstatenonnormalcheck.py
> [experimental]
> nonnormalparanoidcheck = True
> [devel]
> all-warnings=True
> EOF
$ mkcommit() {
> echo "$1" > "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ hg init testrepo
$ cd testrepo
$ mkcommit a
$ mkcommit b
$ mkcommit c
$ hg status