add util.samestat function for windows. windows does not have os.path.samestat, and stat().st_ino is always zero, so util.samestat always returns false on windows.

#!/bin/sh

hg init
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
touch b
hg add b
rm b
hg commit -A -m"comment #1" -d "1000000 0"