[issue25256] Add sys.debug_build public variable to check if Python was compiled in debug mode

[STINNER Victor]

STINNER Victor added the comment:

FYI the sys module has 5 more symbols when CPython is compiled in debug mode:

* getobjects()
* gettotalrefcount()
* last_traceback, last_type, last_value

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25256>
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