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cmake-mode.el: Drop support for Emacs < 24

Hong Xu requested to merge xuhdev/cmake:emacs/drop-23 into master

The cmake--parent-mode alias exists only for compatibility and breaks Emacs packages and scripts that make use of prog-mode-hook because Emacs does not examine whether the parent mode is an alias or not. Remove the alias and require Emacs 24 or higher.

Emacs 24 was released in 2012 and this is already 2019, thus the loss to drop support for versions < 24 is negligible.


Edited by Brad King

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