[PATCH v2 1/3] build: ensure that SHA256_FILE is built

[David Bremner]

Daniel Kahn Gillmor <dkg at fifthhorseman.net> writes:

> The SHA256_FILE used to be built automatically because of the makefile
> dependencies.
>
> Since b8a8dbed91d16299a8768646fb6f18181f31ec40, it isn't getting made
> properly, so the release target would fail.

Pushed these 3 patches to master.

d