dropbear:
	* try to further improve support for non-freetz'ed boxes 
	  (add menuconfig option to enable build for "non-freetz" boxes)
	* don't use "openpty" on non freetz boxes (missing libutil) if non-static binary is built.
	* refs #1240


git-svn-id: file:///var/svn/freetz/trunk@11582 149334a1-2f27-0410-a3b9-fc62619ac1e6