[issue25220] Enhance and refactor test.regrtest (convert regrtest.py to a package)

[STINNER Victor]

STINNER Victor added the comment:

test_regrtest-3.patch: I added a test on PCbuild\rt.bat and fixed the test on Tools/buildbot/test.bat (Windows only tests).

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Added file: http://bugs.python.org/file40609/test_regrtest-3.patch

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