Add comment that BIND-ARGS is broken in similar ways as was DS-BIND.
Name the RAW-SLOT-DATA-COMPARER functions human-readably.
Cleanup some obsolete SB-UNIX symbols from package-data-list

Terminal/keyboard ioctls are not used anywhere in Lisp,
and sgtty was superseded by termios long ago.
O_NOCTTY is needed and is moved with the other O_ flags.
SB-MKSTEMP was listed twice.
Silence a bunch of C compiler diagnostics
Use poll() always in SERVE-EVENT if it's available.

This was put through some production testing,
so it should be good to go, but to paraphrase Martin
"people will surely complain if they don't like it"
Two fewer C compiler warnings.
Fix bug in collecting condition-classoid-class-slots

Also fix test from 5c6f48ae which wasn't testing anything.
Disable test of compute-pollfds if inapplicable