flufl.lock: use patched getfqdn

When running on Mac without "Remote Access" enabled, the hostname returned by socket.gethostname cannot be resolved by socket.gethostbyaddr and so it hangs for ~5 sec and then throws an error [1]. Turns out this is related to an old bug in CPython [2], which hasn't been fixed yet, but other projects affected by this are using a patched version of socket.getfqdn as a workaround.

[1] https://github.com/iterative/dvc/issues/2582 [2] https://bugs.python.org/issue5004

Signed-off-by: Ruslan Kuprieiev ruslan@iterative.ai