fix handling of files of unsupported type in the walk code
if a file was of unsupported type, it was considered as 'seen' while
walking. this way it was possible to have file in the dirstate not
yielded by the walk function.
#!/bin/sh
mkdir a
cd a
hg init
echo foo > t1
hg add t1
hg commit -m "1" -d "0 0"
cd ..
hg clone a b
cd a
echo foo > t2
hg add t2
hg commit -m "2" -d "0 0"
cd ../b
echo foo > t3
hg add t3
hg commit -m "3" -d "0 0"
hg push ../a
hg pull ../a
hg push ../a
hg up -m
hg commit -m "4" -d "0 0"
hg push ../a