Fix test-notify for systems without or with a different version of diffstat.
Some diffstat versions say "1 file changed", others "1 files changed".
#!/bin/sh
mkdir t
cd t
hg init
mkdir a
echo foo > a/a
echo bar > a/b
hg add a
hg ci -m "0" -d "0 0"
hg co -C 0
hg mv a b
hg ci -m "1 mv a/ b/" -d "0 0"
hg co -C 0
echo baz > a/c
hg add a/c
hg ci -m "2 add a/c" -d "0 0"
hg merge --debug 1
ls a/ b/
hg st -C
hg ci -m "3 merge 2+1" -d "0 0"
hg co -C 1
hg merge --debug 2
ls a/ b/
hg st -C
hg ci -m "4 merge 1+2" -d "0 0"