This was done in r80805 (#7908) and erroneously brought back by the
distutils revert.  This commit removes more code than the original,
which was uncomplete.  There is no NEWS entry, like in r80805.

unpickling them produced nonsensical results.

its low-level signal handler.  Patch by Hallvard B Furuseth.

(ISLOWER()/ISUPPER()/etc) have now been removed: use Py_ISLOWER() etc
instead.

Merge the doc for assertTrue/False, assert[Not]AlmostEqual, assert[Not]RegexpMatches, rephrase a couple of paragraphs, and remove redundant doc about the msg arg.

Clears a number of ResourceWarnings in test_httpservers.

in finally. Removes two ResourceWarnings.

as well as unicode strings.  Initial patch by Sandro Tosi.

unused undocumented value PyBUF_SHADOW, and strangely-looking code in
PyMemoryView_GetContiguous.