CC Mode: Fix multiline block comments in macros.
In particulr, handle multiline block comments whose newlines are not escaped. There is an example of this in #define EXTRA_CONTEXT_FIELDS in editfns.c. * lisp/progmodes/cc-engine.el (c-beginning-of-macro, c-end-of-macro): Enclose the loops scanning escaped newlines with outer loops which check heuristically for, respectively, a block comment ender and a block comment starter on the lines we end up on. (A rigorous syntactic check would be too slow, here.) * lisp/progmodes/cc-langs.el (c-last-c-comment-end-on-line-re) (c-last-open-c-comment-start-on-line-re): New language constants/variables.
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