Make compilation-mode regexp matching case-sensitive (bug#40119)

Make compilation-mode regexp matching case-sensitive (bug#40119)

The number of regexps is large, they are written independently of one
another, and they frequently intersect.  Using case-sensitive matching
improves separation and performance, and is probably what everyone
have being assuming was used by compilation-mode all along.

* lisp/progmodes/compile.el (compilation-error-case-fold-search): New.
(compilation-parse-errors): Bind case-fold-search to
compilation-error-case-fold-search during matching.
* etc/NEWS: Announce.