When linking statically against Kerberos, the setup code in
ssh_got_ssh_version() was trying to look up want_id==0 in the list of
one GSSAPI library, but unfortunately, the id field of that record was
not initialised at all, so if it happened to be nonzero nonsense, the
loop wouldn't find a library at all and would fail an assertion.
This gets rid of all those annoying 'win', 'ux' and 'gtk' prefixes
which made filenames annoying to type and to tab-complete. Also, as
with my other recent renaming sprees, I've taken the opportunity to
expand and clarify some of the names so that they're not such cryptic
abbreviations.
