[issue30283] [2.7] Backport test_regrtest (partially) on Python 2.7

[STINNER Victor]

STINNER Victor added the comment:

> I had to remove this decorator from test_tools_buildbot_test() since sysconfig.is_python_build() is false on Python 2.7 built with VS 2008 my Windows VM, whereas I didn't install Python!? I don't know why.

I opened bpo-30342 for this bug.

> Oh, test_regrtest still fails on x86 Windows XP VS9.0 2.7.

With my third commit a5bb62436e25614276ac4b8e252a87f3fcc946cd, test_regrtest pass again on x86 Windows XP VS9.0 2.7 buildbot:

http://buildbot.python.org/all/builders/x86%20Windows%20XP%20VS9.0%202.7/builds/146

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<http://bugs.python.org/issue30283>
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