[issue1414] Fix for refleak tests

[Guido van Rossum]

Guido van Rossum added the comment:

Please check in the frozen-related fixes.

Your changes to test_tcl break that test even when run without -R!

For test_pkg, I would rather see a fix that undoes all the changes to
sys.modules (note that it already restores sys.path and deletes the
files it's created, but that's not enough).

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