[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():
http://bugs.python.org/issue19787#msg206015

So my change might have an effect on this issue.

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