[issue21421] ABCs for MappingViews should declare __slots__ so subclasses aren't forced to have __dict__/__weakref__

[Josh Rosenberg]

Changes by Josh Rosenberg <shadowranger+pyt...@gmail.com>:


Removed file: http://bugs.python.org/file35141/slots_for_mappingview_abcs.patch

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<http://bugs.python.org/issue21421>
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