[Lazarus] Patch for TTrayIcon on Ubuntu's Unity

[Juha Manninen]

A stupid question: what is the best Ubuntu version to test with?
I have avoided Unity desktop so far exactly because of the Lazarus
related problems.

Another question: what about Lazarus built with QT bindings but
running on Unity?

Third question: would it be possible to unite the TrayIcon code for
Unity and other desktops? Now you have 2 separate implementations.

Regards,
Juha