[ewg] removing stgt from being compiled on specific architectures

[Doron Shoham]

Hi Vlad,

I want to remove stgt from being compiled on ia64 and ppc64 architectures.
I added the following lines to sub set_availability on install.pl:

    if ($arch =~ m/ppc|ia/) {
            $packages_info{'tgt-generic'}{'available'} = 0;
    }

but it didn't work - it got compiled anyway.

What is the correct way for doing so?

Thanks,
Doron