[fpc-pascal] Qt4 binding ported to 64bit

[Den Jean]

Hi,

FYI:
thanks to a patch from Giulio Berna, the Qt4 binding 
now also works on 64 bit platforms ( ifdef _LP64... )

Important note from Giulio: 
there is a bug on fpc 2.0.4 that prevents parameters to be 
passed correctly to C functions on x86_64 
(http://www.freepascal.org/mantis/view.php?id=7613).
Now it has been fixed, even if fpc 2.1.1 won't compile itself on x86_64 (as 
suggested by Peter Vreman, you can build a compiler using -Aas: it will fail 
compiling some base packages, but it's enough to have a compiler and rtl 
that can compile qt4.pas and demos on x86_64).

kind regards,

Den Jean