wisent.el: Prefer `define-mode-local-override`

wisent.el: Prefer `define-mode-local-override`

* lisp/cedet/semantic/wisent.el (wisent--parse-stream): Rename from
`wisent-parse-stream` and mark the old name obsolete.
(semantic-parse-stream): Override with `define-mode-local-override`.

* lisp/cedet/semantic/wisent/grammar.el
(semantic-grammar-setupcode-builder): Don't override
`semantic-parse-stream` manually here via
`semantic-install-function-overrides`.

* lisp/cedet/semantic/grm-wy-boot.el: Refresh.