Add :version tags to defcustoms in comp.el

Add :version tags to defcustoms in comp.el

* lisp/emacs-lisp/comp.el (comp-speed, comp-debug, comp-verbose)
(comp-never-optimize-functions, comp-async-jobs-number)
(comp-async-cu-done-hook, comp-async-all-done-hook)
(comp-async-env-modifier-form)
(comp-async-report-warnings-errors, comp-native-driver-options)
(comp-libgccjit-reproducer): Add :version tags.