test-mq-qimport: fix URL generation under windows

tests/test-mq-qimport

@@ -33,7 +33,14 b' hg add foo'
 hg diff > $HGTMP/url.diff
 hg revert --no-backup foo
 rm foo
-hg qimport file://$HGTMP/url.diff
+# Under unix: file:///foobar/blah
+# Under windows: file:///c:/foobar/blah
+patchurl=`echo $HGTMP/url.diff | tr '\\' /`
+expr $patchurl : "\/" > /dev/null
+if [ $? -ne 0 ]; then
+    patchurl='/'$patchurl
+fi
+hg qimport file://$patchurl
 hg qun
 
 echo % import patch that already exists