[issue4910] Remove uses of nb_long slot, and rename to nb_reserved.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

That was a pretty poor patch.  Here's a better one:

 - added Misc/NEWS entry
 - added tests to check that __long__ is never called
 - removed Modules/_struct.c change, in the interests of
   keeping the patch focused.

Added file: http://bugs.python.org/file12697/issue4910_1a.patch

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