mpatch: Define Py_ssize_t for old pythons and use it instead of ssize_t.
See also PEP 353.
NOTE: Microsoft compilers (8 or earlier) does not have ssize_t.
#!/bin/sh
hg init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1