Dropping obsolete function call

mod/workshop/lib.php

@@ -223,16 +223,6 @@ function workshop_install() {
     return true;
 }
 
-/**
- * Execute post-uninstall custom actions for the module
- * This function was added in 1.9
- *
- * @return boolean true if success, false on error
- */
-function workshop_uninstall() {
-    return true;
-}
-
 /**
  * Returns the information if the module supports a feature
  *