(svn r15123) -Fix [NoAI]: 'const char *' implies that the return value should not be free'd, which is should .. so make them 'char *'

src/ai/api/ai_error.hpp

@@ -134,7 +134,7 @@ public:
 	 * Get the last error in string format (for human readability).
 	 * @return An ErrorMessage enum item, as string.
 	 */
-	static const char *GetLastErrorString();
+	static char *GetLastErrorString();
 
 	/**
 	 * Get the error based on the OpenTTD StringID.