- Apply a patch from Niko Tyni (ntyni@debian.org) that resolves RT #48879;
As seen in [rt.cpan.org #48879], although the recommended way of
retrieving the last error is to use an instance method ($tar->error),
the returned value is effectively global: an error in one Archive::Tar
instance changes the error string of another instance.
This change separates the error strings from each other while keeping
the (deprecated) global value of $Archive::Tar::error pointing to the
last error regardless of its instance.
We also support calling error() as a class method (Archive::Tar->error).
In this case it returns the global value, which matches the old behaviour.