D3117: tests: make test-convert-git.t more deterministic

[durin42 (Augie Fackler)]

durin42 added a comment.


  This seems to break things with git 1.8.3.1, which is what's on gcc112. Should we just ratchet our test requirements forward, or try and figure out what changed?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3117

To: indygreg, #hg-reviewers, durin42
Cc: mercurial-devel