patches from Mark Hammond

compile.py:
On Windows, use 'nul' instead of '/dev/null'.

test.py:
Use double-quotes for the command-line, as Windows doesnt recognise
singles.

Tools/compiler/compile.py

@@ -11,6 +11,9 @@ def main():
             VERBOSE = 1
             visitor.ASTVisitor.VERBOSE = visitor.ASTVisitor.VERBOSE + 1
         if k == '-q':
+            if sys.platform[:3]=="win":
+                f = open('nul', 'wb') # /dev/null fails on Windows...
+            else:
                 f = open('/dev/null', 'wb')
             sys.stdout = f
     if not args: