Detect working functions, not just existence

[grimreaper]

autotools as a mechanism to detect that the functions it detects works,
not just exists. For these functions, use those macros.

[pablogsal]

Please, open an issue in http://bugs.python.org and reference that issue number in the pull request title. More info about the workflow:

https://devguide.python.org/pullrequest/#submitting

[pablogsal]

The CI is failing with:

Traceback (most recent call last):
  File "/home/travis/build/python/cpython/Lib/test/test_logging.py", line 3389, in test_time
    r.created = time.mktime(dt.astimezone(None).timetuple())
AttributeError: module 'time' has no attribute 'mktime'
``

[csabella]

Thank you for your interest in improving CPython. This is not a trivial change and would require an issue to be created on bugs.python.org, as previously requested. If you are interested in pursuing this, please open an issue on the bug tracker and reopen this pull request with the bpo number in the title as per the devguide. Also, please resolve the merge conflicts once reopened. Thanks!