In two places, CPerl mode checks whether `syntax-propertize-rules` is
fboundp, which is always true as of today.  The attached patch
eliminates this check and the corresponding "else"-Branches.

Also, an (undocumented) debug trace doesn't work in current Emacs
because the function `edebug-backtrace` was eliminated, so this call is
removed by the patch.

Finally, a workaround to set `font-lock-syntactic-keywords` is no longer
needed.  This eliminates a warning when compiling cperl-mode.el under
current Emacs.

-- 
Cheers,
haj