Problem: libedit is a very pure-ASCII oriented library,
and it is not aware of extended (0x80..0xFF) or even multi-byte
characters. It considered such characters as non-printable
and didn't allow to input them.
Fix: make libedit think that all bytes >= 0x80 are printable.
2. changed key_* to el_ley_* in the libedit key.h
(because it's in the conflict with the aix definitions)
3. use libedit_term.h instead of term.h in the cmd-line-utils/libedit/el.h
4. added definition of MIN in the cmd-line-utils/libedit/read.c
(if it wasn't defined yet)
5. discarded definition of SUNOS macro from configure.in
(now we don't include term.h in the el.h at all)
