* lisp/cedet/semantic: Remove some dead code

* lisp/cedet/semantic: Remove some dead code

* lisp/cedet/semantic/util-modes.el
(semantic-stickyfunc-header-line-format): Emacs<22 is not supported
any more.
* lisp/cedet/semantic/fw.el (semantic-buffer-local-value): Emacs<21 is
not supported any more.
(semantic-safe): Use `declare'.
* lisp/cedet/semantic/decorate.el (semantic-set-tag-intangible)
(semantic-tag-intangible-p): Remove unused functions.
* lisp/cedet/semantic/complete.el (semantic-displayor-window-edges):
Remove unused function.