test_subprocess: 'execution environment' behavior of recompiled code (Python 3.4?)

[peterazmanov]

I compiled Python 3.4.3 in debug and ran all tests, maybe I did something wrong but 'test_subprocess' was reported in group of tests that 'altered the execution environment'. After Python-Lib-recompile 'test_subprocess' succeeds. That's strange and requires further testing.

In Python 3.5.1 issue is not reproduced.