.editrc on linux.
MySQL client when build with libedit support ignores
.editrc at startup.
The reason for this regression was the incluison of a
safety check, issetugid(), which is not available on
some linux platforms.
Fixed by adding an equivalent check for platforms which
have get[e][u|g]id() set of functions.
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)
