Fixed|Builder|Windows: Checking state of produced packages

The DirState utility class did not know how to handle Windows-style path
separators, causing the produced packages to not be copied to the
BuildMaster.

distrib/builder/utils.py

@@ -11,7 +11,7 @@
 def omit_path(path, omitted):
     if path.startswith(omitted):
         path = path[len(omitted):]
-        if path[0] == '/': path = path[1:]
+        if path[0] == '/' or path[0] == '\\': path = path[1:]
     return path