tests/test-gendoc-zh_CN.t

convert: pass absolute paths to git (SEC)

Fixes CVE-2016-3105 (1/1).

Previously, it was possible for the repository path passed to git-ls-remote
to be misinterpreted as a URL.

Always passing an absolute path to git is a simple way to avoid this.

#require docutils gettext

  $ $TESTDIR/check-gendoc zh_CN
  checking for parse errors