[Lazarus] PowerPDF Installation

[Lee Jenkins]

This is documented in the wiki:

http://wiki.lazarus.freepascal.org/Carbon_Interface#Compiling_Carbon_interface_via_Makefile

OpenGL is the only way to obtain a screenshot, and LCL needs to
support screenshot taking.

In the near future there will also be a optional dependency in Cocoa,
because TTrayIcon can only be implemented with Cocoa.

-- 
Felipe Monteiro de Carvalho