[Lazarus] INVALID_* consts

[Alberto Narduzzi]

>
> all i can do is point to the links i just posted to mattias where it is
> defined and routines are shown with how to use it...

Uh... I just went through the first 2 or 3 links and the amount of crap 
I found is unbelievably enormous.

Why the hell should I consider 4 platforms on 2 architectures; then 
check the result whether I passed or not a NULL pointer to... ehm, well, 
just get the f***ing size of a file???? This, I am sorry, is out of my 
imagination scope.

God bless the one libc (end its ports, where possible, clean and 
working). full stop.

Cheers, A.