net.cqueues: Fixes hardcoded timeout for first iteration
net.cqueues: Fixes hardcoded timeout for first iteration

This was originally put in place as a fix for what ended up a cqueues bug: https://github.com/wahern/cqueues/issues/40
A check for a cqueues version with the bug fix is included.

sarumjanuch/prosody,sarumjanuch/prosody