fix the function ‘ecb-deactivate’ might not be defined at runtime.

FS #2

modules/init-ecb.el

@@ -13,10 +13,15 @@
   (setq ecb-examples-bufferinfo-buffer-name nil)
 
   (defun ecb-toggle ()
+    "Toogle ECB."
     (interactive)
+    (eval-when-compile (require 'ecb nil t))
+    (when (and (require 'ecb nil t)
+               (fboundp 'ecb-deactivate))
       (if ecb-minor-mode
           (ecb-deactivate)
-      (ecb-activate)))
+        (ecb-activate))))
+
   (global-set-key [f2] 'ecb-toggle)
 
   )