tests/test-hgk.t

test-convert-git: remove the read-only attribute of repository files

Git object files are stored read-only in the filesystem. Trying to remove a
read-only file on windows will fail with access denied, so we have to make them
writeable before they can be removed.

Minimal hgk check

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "hgk=" >> $HGRCPATH
  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ hg debug-cat-file commit 0
  tree a0c8bcbbb45c
  parent 000000000000
  author test 0 0
  committer test 0 0
  revision 0
  branch default
  
  adda