[Lazarus] Patch for TTrayIcon on Ubuntu's Unity

[Anthony Walter]

""Maybe, but only in case if it's easy to extract information if we are
under unity wm or other wm (I guess that it should not be an issue)."

{ UnityAppIndicatorInit returns true if Unity is the current desktop and
  the required appindicator libraries can be loaded }

function UnityAppIndicatorInit: Boolean;

The relevant HOWTO:

https://github.com/sysrpl/Lazarus.UnityAppIndicators/blob/master/lazarus/lcl/interfaces/gtk2/unitywsctrls.pas#L263-L267
https://github.com/sysrpl/Lazarus.UnityAppIndicators/blob/master/changes.patch#L18
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