rust-cpython: change license of ref_sharing.rs to MIT
Since we plan to upstream this feature, it's better to continue further
refactoring under the same license as rust-cpython crate.
According to the file history, copyright holders are:
- Raphaël Gomès <rgomes@octobus.net>
- Valentin Gatien-Baron <valentin.gatienbaron@gmail.com>
- Yuya Nishihara <yuya@tcha.org>
Test for changeset ba7c74081861
(update dirstate correctly for non-branchmerge updates)
$ hg init a
$ cd a
$ echo a > a
$ hg add a
$ hg commit -m a
$ cd ..
$ hg clone a b
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd a
$ hg mv a b
$ hg commit -m move
$ echo b >> b
$ hg commit -m b
$ cd ../b
$ hg pull ../a
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 1 files
new changesets e3c9b40284e1:772b37f1ca37
(run 'hg update' to get a working copy)
$ hg update
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ cd ..