Log Message:
When adding --with-ioloop=best last week, I did not see there already was a
pkgsrc option for kqueue support.  Hence, remove --with-ioloop=best again, and
enable the "kqueue" option by default on *BSD platforms (as already \ 
suggested
by grant when he first added the option).  The pkg's default behaviour does
not change, so don't bump PKGREVISION.