fix strip on windows

c: was interpreted as a protocol, prepend file: to the bundle file name

hgext/mq.py

@@ -702,6 +702,7 b' class queue:'
         if saveheads:
             backupch = repo.changegroupsubset(savebases.keys(), saveheads, 'strip')
             chgrpfile = bundle(backupch)
+            chgrpfile = 'file:%s' % chgrpfile
 
         stripall(rev, revnum)