D5859: subrepo: migrate to scmutil.backuppath()

[martinvonz (Martin von Zweigbergk)]

martinvonz added a comment.


  In https://phab.mercurial-scm.org/D5859#85954, @martinvonz wrote:
  
  > This one breaks tests, so I'll need to fix that.
  
  
  Done.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D5859

To: martinvonz, #hg-reviewers
Cc: mercurial-devel