shared libraries support in gdc and gdc compilation

[eles]

Hi,

The two quick questions that I have:

- does gdc support shared libraries compilation/linking, or it 
will rely on pending dmd changes to implement that feature?

- does the gdc-4.8 (and, while at it, the gdc-4.7) branch receive 
updates or it is toi be considered as frozen and abandoned?

Thanks,

eles