[COMMIT] Test that all listed langenv input methods exist.

[Stephen J. Turnbull]

Aidan Kehoe writes:

 > I can’t actually get the problem to reproduce itself outside the
 > context of that test. I imagine, though, that you’ve been seeing
 > the test failure too, unless your /tmp/ directory is on a UFS
 > mount.

Yup.  Your change *does* fix that test for me.

However, I'm seeing two new unexpected failures due to lack of a
"latin-iso8859-5" charset.  Since there is none, I guess that's not
unreasonable. ;-)  Please s/latin-iso8859-5/cyrillic-iso8859-5/.  (Or
whatever it's supposed to be.)