pdb2pqr @2.0.0: not UsingTheRightCompiler or -arch flags

[ryandesign (Ryan Carsten Schmidt)]

Since pdb2pqr switched to using scons, it's now not UsingTheRightCompiler which it previously was. It's also not using -arch flags, which it wasn't before because it was using a compiler from the gcc ports, not all of which support -arch flags, but now that it's using Xcode compilers it should use -arch flags. Maybe the universal variant can be enabled then too.