builddependencies: don't add dependency on revision outside input set
This was already handled in the single-successor case, but had been
missed in the multiple-successors case.
Note that there seems to be a copy of builddependencies() in the
topics extension. I don't use topics more than I have to, so I'll let
someone else fix that code.
#!/bin/sh
sleep 5
echo "new desc" >> $1