#9 FreeBSD build fixes for 2.4.0

[pawelbsd]

Small build fixes:
- ulong is not defined on FreeBSD
- old gcc don't like symbols defined twice

[Salsaman]

Thanks !

I have taken the liberty of fixing this in a slightly different way - the #define ulong is better in main.h:

https://sourceforge.net/p/lives/code/2246/tree/trunk/src/main.h?diff=505487e4bfc09e4ced4d35a9:2245&diformat=regular

The second issue I think was already fixed in a simpler way:
https://sourceforge.net/p/lives/code/2244/tree//trunk/src/colourspace.c?diff=505487e4bfc09e4ced4d35a9:2243

Please can you check if these two fixes resolve the issues.

[pawelbsd]

Your patches fixed mentioned build issues for me, thanks.