; cperl-mode.el: Allow bare $ in a signature (Bug#74245)

; cperl-mode.el: Allow bare $ in a signature (Bug#74245)

* lisp/progmodes/cperl-mode.el (cperl--signature-rx): Allow bare
sigils for unused parameters in signatures.
(cperl-find-pods-heres): Avoid $) at the end of a signature being
treated as the punctuation variable $) by treating this dollar as
punctuation

* test/lisp/progmodes/cperl-mode-tests.el
(cperl-test-signature-rx): Add ($first,$) as a valid signature,
remove ($) from the list of invalid signatures.

(cherry picked from commit b74ac4af9408230645f1edb56c410b7a80bb41d2)