hackrf release bundles don't automate installing pre-built firmware

[rfc6919]

Downstream packagers of the hackrf tools don't install the firmware-bin pre-built firmware from release bundles, because (in at least one case) there's no supplied automated way to do so. It'd be nice if it was obvious to downstream packagers that the pre-built firmware should be made available on users' systems.

Ideally this shouldn't be part of the firmware build process, since packagers shouldn't have to also have a working cross toolchain and the opencm3 &c deps installed. I'm not sure the nicest way to do this, perhaps even just including a note in the Readme.md that packagers should also install firmware-bin to /usr/share/hackrf/firmware-bin would help?

Steps to reproduce

1. download release bundle
2. look for a make install option to install pre-built firmware

Expected behaviour

There's a way to install the included pre-built firmware other than just copying the firmware-bin directory

Actual behaviour

There isn't a way to install the pre-built firmware other than just copying the firmware-bin directory

[ZeroChaos-]

This is what I do for gentoo, it could be easily scripted if desired

https://github.com/gentoo/gentoo/blob/master/net-wireless/hackrf-tools/hackrf-tools-2021.03.1.ebuild#L34-L43

[mossmann]

We feel that copying firmware binaries to a system directory is a distribution-specific solution that should be up to packagers, so we've decided not to provide a script for that. Thank you for showing how it can be done, @ZeroChaos- !