Fix undefined reference to `cleanup_battery' when using --disable-battery.

git-svn-id: http://tint2.googlecode.com/svn/trunk@248 121b4492-b84c-0410-8b4c-0d4edfb3f3cc

src/config.c

@@ -73,7 +73,9 @@ void init_config()
 
 	// tint2 could reload config, so we cleanup objects
 	cleanup_systray();
+#ifdef ENABLE_BATTERY
 	cleanup_battery();
+#endif
 	cleanup_clock();
 	cleanup_tooltip();