Added support for armel (ARMv5) architecture

[ant9000]

Straightforward patch for armel arch (ARMv5 soft-float) support.

Thanks a bunch for your wonderful project!

[binwiederhier]

1. I removed ARMv5 support at some point for some reason. I forgot what it was. I think it had to do with the Debian repo software (aptly) not being able to deal with two different arm versions or something. If you look through the tickets you may find it.

Try doing a make release-snapshot and see if there are any issue with the .deb packages, maybe list them here.

2. You'll need to update the install.md file too for the docs, assuming that (1) is not an issue.

[ant9000]

Wasn't able to find any reference to ARMv5/armel in past issues, but I see your point with regards to aptly: you have two different packages for the same architecture, since ARMv6 and ARMv7 are both armhf.
This should not be a problem with ARMv5, since the architecture is armel, which is indeed different.
I've done a make release-snapshot and spotted a few places where my first patch was incomplete - now it generates all the packages, and not only the binary executable.
I've added the relevant sections to install.md too.

PS: developer docs fail to mention a dependence on docker.

[binwiederhier]

6?

[ant9000]

Whoopsie 😊 Thanks!