Improve TTY library detection

Improve TTY library detection

	* configure.ac: Iterate over all "auto" libraries by order of
	preference to find out which are linkable.  Add libraries
	requested on command line by adding --with-<lib>=yes before the
	auto ones.  Then find which libraries are needed to get all of the
	required terminal functions.  Check if combination still allows
	for all functions to build.  When all else fails if
	--with-builtin-tty=yes is passed, use that.

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>