[Bug 103] New: -Dd does not generate subdirectories

[Frank Benoit]

> I'll put that into Build ... if it sees -D<path> it will ensure the path
> exists before calling the compiler.
> 
> --Derek Parnell
> Melbourne, Australia

Only to clarify. The problem is not only the named path from -Dd<path>,
the bug report should show, dmd is not generating the directory tree
beneath that path, representing all packages.