allow SDL 1.2 to at least do a 32767 map. We probably should add a TryDo somewhere to assert that limit on SDL 1.2 to avoid overflows. Ditto int version for SDL 2
Added tag 0.9.20-release for
changeset af0520a6bf00
switch every optimization from Os to O2
Also move 'disable optimizations' in the internal pascal file for debug mode.