Failure to check testing git repository

[ferki]

Describe the bug

Similarly to #1589, checking the git repository used for testing purposes fails for ancient versions of git when git -C is used instead of cd-ing into the directory.

See for example: http://www.cpantesters.org/cpan/report/5056406c-010c-11ee-a26f-43e86d8775ea

Expected behavior

t/scm/git. should either pass, or back off gracefully.

How to reproduce it

Run t/scm/git.t tests on a git version old enough without -C support (like older than 1.8.5).

Code example

No code example.

Additional context

Apparently I overlooked that single remaining instance of git -C call on my previous fix attempt.

Rex version

1.14.2.1

Perl version

5.24.0

Operating system running rex

Debian Wheezy

Operating system managed by rex

local

How rex was installed?

cpan client