Fix ill-named Test::Harness test and bump version.

Fix ill-named Test::Harness test and bump version.

env.opts.t by its very existence causes the test suite to die on
VMS with:

$ perl TEST ../cpan/Test-Harness/t/compat/env.opts.t
Can't read ../cpan/test-harness/t/compat/env.opts.t.
%RMS-F-SYN, file specification syntax error

Enabling the extended filename character set will fix this but that's
not (yet) the default setting.  So here we simply rename the file to
something legal.

Reported upstream as [rt.cpan.org #78127].