Severity: minor

With this patch, cperl-mode.el no longer informs the user about "Font
lock bugs" which have been fixed - or worked around - long ago: Some of
Perl's punctuation variables contain string delimiters ($`, $' and $")
but they don't start strings.  Fontification handles this correctly.

The patch eliminates the comment, and it comes with a test to verify
that cperl-mode gets it right in all cases which were listed in the
comment, plus some more.