Revert "t/60-multi-wait.t fixed (spawning too fast)"

This reverts commit 0d044e26b40f7e435e4085d518503cab12507b14.
Test::HTTP::Server seems to be unable to spawn too many simultaneous responders on *BSD
libcurl/7.32.0 breaks t/old-10errbuf.t
Version bump
Changelog update