fix file opening for some commands on Windows Using file as opener in debug commands won't work on Windows, as the index and data files needs to be opened in binary mode.

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 1
kill -HUP $P
sleep 1
ls .hg