Add test target.
Don't try to crap into the user's home directory.
Fix dependencies.
Fix build with clang.
Packaged synergy 1.4.14

This version is not the latest, but apparently good enough to solve a
security issue (according to audit-packages).

New features:
Feature #46 – Drag and drop between computers (Windows and Mac)

Fixed bugs:
Bug #3287 – Mac does not wake up
Bug #3758 – Unstable service (synergyd)
Bug #3759 – Exploit: C:Program.exe (if it exists) is run by service (elevated)
Bug #3760 – Encryption broken (GCM, CTR and OFB)
Bug #3761 – Start button is visible when Synergy is running
Bug #3762 – Apply button is disabled for Mac and Linux
Updated net/synergy to 1.4.14