gtkD doesn't compile on windows

[Trass3r]

I built the fourth example  
(http://dsource.org/projects/gtkd/wiki/CodeExamples) using rdmd and it  
worked fine (regarding gtkD).
(svn version of gtkD)

There's a rdmd bug though. 'rdmd --build-only --chatty  
-I~/coding/gtkD/src/ -L-ldl test.d'
doesn't directly work cause the .rsp file contains 'dmd'.
But if you execute the command inside the .rsp it builds without problems.