- Rebase and re-add tidy-up-embeddedfile.patch, it was only partially merged
upstream.

- update to 5.4.3
* Paths appearing in error messages are now correct in case the current working
directory has changed since the start of the session.
* Support deleting paths longer than 260 characters on windows created inside tmpdir.
* Prevent pytest from printing ConftestImportFailure traceback to stdout.
* Prevent hiding the underlying exception when ConfTestImportFailure is raised.
* Fix regression where running with --pdb would call the tearDown methods
of unittest.TestCase subclasses for skipped tests.