rhg: Initial repository locking
Initial Rust implementation of locking based on the `.hg/wlock` symlink (or file),
with lock breaking when the recorded pid and hostname show that a lock was
left by a local process that is not running anymore (as it might have been
killed).
Differential Revision: https://phab.mercurial-scm.org/D11835
# See http://EditorConfig.org for the specification
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[*.{c,h}]
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