I broke automatic "use" for some cases

[Charles]

I fixed some regression bugs on the Mono side involving "use System.Net" and also fixed the -native-compiler option reported in the "win32manifest" thread. However, in doing so, I broke ticket:152 which has been reopened with a comment with the bloody details.

If you use the latest source, this means that for cases such as:

use System.Windows.Forms
use System.Drawing

# you will need to add:

@args ref:System.Drawing

We'll get this right eventually. For now, the workaround is easy.