`bitcoind-tests` has a dependency on `bitcoin` so it makes depending on
a local patched version more difficult, just temporarily delete it.

Depend on the `crate-smashing` branch, which introduces the new
`primitives`, `bip32`, and `psbt-v0` crates.

The point of this patch is to try to show we have all the re-exports
correct in `rust-bitcoin` after introducing the new crates.

Apart from the manifest changes this patch changes a single line, BOOM!