From chroot-git 2.33.1, we always have an executable named git
for other build infrastructure and lints.
Let's remove the shenanegan to find which git to be used, prepend the
path to chroot-git's git into $PATH, and let's the shell call the
correct git for us instead.
As of today, everything fails on CI with:
```
Run common/travis/fetch_upstream.sh
Fetching upstream...
fatal: remote error:
The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.
Error: Process completed with exit code 128.
```
Switching `git://` to `https://` should fix this.
Đoàn Trần Công Danh
classabbyamp
Gonzalo Tornaría
maxice8
Enno Boland