[Qt] FREEBSD Supports

[Den Jean]

Hi,

In order to support FREEBSD (and possibly NETBSD) I propose
to replace the LINUX ifdefs with UNIX.

Because freepascal defines UNIX on LINUX, FREEBSD and NETBSD.

http://www.freepascal.org/docs-html/prog/progap7.html#x310-311000G

The compile script for LINUX (directly usable on BSD) should be changed to 
contain
g++ -D UNIX .......
instead of 
g++ -D LINUX .....

any remarks ?

regards,

Den Jean