Replace some inappropriate uses of toggle-read-only. (Bug#7292)

Replace some inappropriate uses of toggle-read-only.  (Bug#7292)

* lisp/speedbar.el (speedbar-mode):
* lisp/play/fortune.el (fortune-in-buffer, fortune):
* lisp/play/gomoku.el (gomoku-mode):
* lisp/play/landmark.el (lm-mode):
* lisp/textmodes/bibtex.el (bibtex-validate, bibtex-validate-globally):
* lisp/cedet/mode-local.el (mode-local-augment-function-help):
* lisp/semantic/analyze/debug.el (semantic-analyzer-debug-add-buttons):
* lisp/semantic/symref/list.el (semantic-symref-results-dump)
(semantic-symref-rb-toggle-expand-tag):
Replace inappropriate uses of toggle-read-only.