Only solaris+svr4 uses
unix:unix-times. Everyone uses
unix:unix-getrusage or similar to get this information. Let's make it uniform and not use
unix:unix-times on solaris anymore. Also gets rid of some conditional code. Yay!
This is used in
get-internal-run-time, so there weren't many uses anyway. But leave it defined in unix.lisp for backward compatibility.