bug#25230: Patch to ispell.el to simplify use of [:alpha:] for CASECHARS in built-in dictionaries

[Reuben Thomas]

I noticed that I had not quite finished the work of commit 854ed8a, which removed the test for support for POSIX character classes, as that is now guaranteed.

In ispell-set-spellchecker-params, there is code that used to be run conditionally on support for POSIX character classes, which sets all the CASECHARS and NOT-CASECHARS entries for built-in dictionaries to [[:alpha:]] and [^[:alpha:]] respectively.

There is no point doing this unconditionally, so instead, put these character classes directly into the initial values used in ispell-dictionary-base-alist. This change also makes the variable's initialization easier to read.

The attached patch makes these changes.

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0001-Use-alpha-by-default-for-ispell-built-in-dictionarie.patch
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