File-chdir on Perl 5.13.1

For any Perl developers who use File::chdir, please note that Perl 5.13.1 fixed a bug with tied variables in a way that broke things for File::chdir. The change has been reverted and I expect to see File::chdir passing tests on 5.13.2 when it is released.

In the meantime, I’ve released a new version of File::chdir that bails out during configuration on 5.13.1 with an explicit error message. This gives NA results during CPAN smoke testing, which is more appropriate than FAIL results.