* lisp/progmodes/perl-mode.el: Fix handling of s'foo'bar'

* lisp/progmodes/perl-mode.el: Fix handling of s'foo'bar'

(perl-syntax-propertize-function): Don't put a syntax-property
on regexp-op delimiters if they're already handled correctly
by the normal syntax tables.
(perl-syntax-propertize-special-constructs): Mark the middle
quote of s'foo'bar' as punctuation.

* test/manual/indent/perl.perl: Add new test cases.