Minor casefiddle.c cleanups
* src/casefiddle.c: Redo recent changes to match GNU style, and prefer C99-style decls within blocks. (GREEK_CAPITAL_LETTER_SIGMA): Rename from CAPITAL_SIGMA, so that we are merely using the Unicode name, and make it a constant rather than a macro. All uses changed. (SMALL_SIGMA): Remove; unused. (GREEK_SMALL_LETTER_FINAL_SIGMA): Rename from SMALL_FINAL_SIGMA, and make it a constant rather than a macro. All uses changed. (do_casify_multibyte_string): Use ‘verify’ rather than an unportable static_assertion local.
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