Amend CC Mode so that the test suite in XEmacs runs error free

* lisp/progmodes/cc-awk.el (awk-font-lock-keywords):
Reformulate this using backquote and ,@.  Only include the
entry for _" in Emacs.

* lisp/progmodes/cc-defs.el (c--mapcan, c--set-difference)
c--intersection, c--macroexpand-all, c--delete-duplicates): No
longer use the existence of cl-lib.el as the criterion for
what to expand to.
(c-min-property-position): Use c-next-single-property-change
rather than next-single-property-change.  This now works in
XEmacs.

* lisp/progmodes/cc-engine.el
(c-invalidate-sws-region-after-del)
(c-invalidate-sws-region-after-ins, c-forward-sws)
(c-backward-sws, c-find-decl-spots): Replace
next/previous-single-property-change by
c-next/previous-single-property-change to ensure functionality
in XEmacs.
(c-forward-sws, c-backward-sws): Handle NO-BREAKING-SPACE as
whitespace.  This corrects the error in hardspace.c in the test
suite.

* lisp/progmodes/cc-fonts.el (c-font-lock-ml-strings): Refactor
some nested `if's into a cond form.  Don't fontify multiline
string delimiters in XEmacs, in keeping with its string
conventions.

* lisp/progmodes/cc-langs.el (c-populate-syntax-table): Set the
syntax of NO-BREAKING-SPACE to whitespace rather than
punctuation.

* lisp/progmodes/cc-mode.el (c-before-change): Use
c-previous-single-property-change rather than
previous-single-property-change to ensure functionality in
XEmacs.

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