Add 'subterfuge'.
subterfuge: Make some unimportant style and quote changes.

Most of these changes are for the sake of consistency with other
packages. This also quotes `$pkgdir` and `$srcdir`. Quoting these
variables in the other packages is on a todo list.
subterfuge: Quote `$@` in the joint script.
subterfuge: Fix a few mistakes.

These were my fault. Somehow, I was testing with the original file.