znc-buildmod: build output to the current working directory

If I run znc-buildmod in ~/.znc/modules and pass it a module source
from another directory, I expect the build output to go to the current
working directory instead of the source directory of the module.
Fix build without threads
Update Csocket to 5746796ca55d21fa185caf7c58d015f650b77768
Honor SSL ciphers in ZNC->Server connections
Merge pull request #758 from jpnurmi/buildmod

znc-buildmod: build output to the current working directory
Pass timestamp to playline hooks

This allows implementing timestamp-based (eg. client specific - #343)
filtering of playback buffers. For clients that don't support server-time,
getting an accurate timestamp out of a raw buffer playline is impossible.