Only compile&install a minimum host Gforth for bootstrapping the target
Gforth, removing strange emacs-dependencies that cropped up earlier.
Image file can now be built on the nanonote using 'gforth-update-image'
command. Also, Gforth is now run through a wrapper that calls
'gforth-update-image' automatically, if necessary.
Also first attempts at supporting libcc C-interface libraries pre-compiled on
the host.
Tested to compile on amd64 and i386.
