[issue15751] Support subinterpreters in the GIL state API

[STINNER Victor]

STINNER Victor added the comment:

> FYI I fixed a weird behaviour of the PyThread_set_key_value() function. > The change has indirectly on impact on test.support.run_in_subinterp():

The impact was a bug. I reverted my changeset and pushed a new changeset which leaves _PyGILState_NoteThreadState() unchanged.

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<http://bugs.python.org/issue15751>
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