opkg_manager.cpp: disable unused variable

avoid compiler error/warning


Origin commit data
------------------
Commit: 92b579b3c6
Author: Thilo Graf <dbt@novatux.de>
Date: 2015-12-28 (Mon, 28 Dec 2015)

src/gui/opkg_manager.cpp

@@ -701,7 +701,7 @@ int COPKGManager::execCmd(const char *cmdstr, int verbose_mode)
 	int res = 0;
 	has_err = false;
 	tmp_str.clear();
-	bool ok = true;
+	//bool ok = true;
 
 	//create CShellWindow object
 	CShellWindow shell(cmd, verbose_mode, &res, false);