lisp/*.el: Add missing declarations.

lisp/*.el: Add missing declarations.
* descr-text.el (quail-find-key):
* dired.el (desktop-file-name):
* dirtrack.el (shell-prefixed-directory-name, shell-process-cd):
* generic-x.el (comint-mode, comint-exec):
* image-dired.el (widget-forward):
* info.el (speedbar-add-expansion-list, speedbar-center-buffer-smartly)
(speedbar-change-expand-button-char)
(speedbar-change-initial-expansion-list, speedbar-delete-subblock)
(speedbar-make-specialized-keymap, speedbar-make-tag-line):
* printing.el (easy-menu-add-item, easy-menu-remove-item)
(widget-field-action, widget-value-set):
* speedbar.el (imenu--make-index-alist):
* term.el (ring-empty-p, ring-ref, ring-insert-at-beginning)
(ring-length, ring-insert):
* vcursor.el (compare-windows-skip-whitespace):
* woman.el (dired-get-filename):
Declare functions.

* term/w32-win.el (cygwin-convert-path-from-windows): Fix declaration.