Log Message:
libuv: add and use autoconf test for pthread_condattr_setclock.
This call is absent in netbsd-6-0. libuv built anyway, but it later died
with undefined references in cmake.

I read outdated information and assumed that the previous attempt at
fixing the problem did not make a functional change, but it did.
pthread_condattr_setclock does have an effect on netbsd.

bump PKGREVISION so it is rebuilt, and for previous functional change.

thanks joerg and riastradh for clearing things up.