[Additions]
- The PERL_PATH_TINY_NO_FLOCK environment variable has been added to
allow users to disable file locking (and any associated warnings).
[Changes]
- Detection of unsupported 'flock' is no longer BSD-specific. This
allows detecting and warning, for example, with the Luster filesystem
on Linux.
[Tests]
- Improve reliability and diagnostics of tests run via 'do'.