largefiles: allow to run 'debugupgraderepo' on repo with largefiles
The extensions wrap the necessary function to ensure the 'largefiles'
requirements won't be dropped.
It is now possible to run `hg debugupgraderepo` on a repository with largefiles.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true