Makefile install fixes

[laenion]

This pull request tries to fix two Makefile bugs of the install target:

1. On 32 Bit x86 machines the ignition binaries were searched in the wrong directory due to a missing Go architectures <-> Linux hardware name; another mapping was introduced, handling various machine strings such as i486 or i686.
2. Dracut and systemd are all installed with the default permissions of 755. Separate the files by extension and assign the matching permissions so the executable bit is only set for scripts. This will also avoid warning by systemd due to the incorrect permissions.

[jlebon]

On 32 Bit x86 machines the ignition binaries were searched in the wrong directory due to a missing Go architectures <-> Linux hardware name; another mapping was introduced, handling various machine strings such as i486 or i686.

BTW, are you actually planning to use Ignition on 32-bit platforms? For FCOS/RHCOS at least, we don't currently support that and don't plan to. It's possible you'll hit other snags along the way.

[laenion]

BTW, are you actually planning to use Ignition on 32-bit platforms? For FCOS/RHCOS at least, we don't currently support that and don't plan to. It's possible you'll hit other snags along the way.

Not really, as we are not building MicroOS or Kubic for any 32 bit platform, either. However - as they are sharing their repository with Tumbleweed which supports i586 - I didn't see a reason to explicitly prevent it from building on x86. We don't have any automated tests of the x86 build, but Ignition seemed to be working fine so far, and I will see build failures (it's the second one, the first one was #944)...

[laenion]

We also got a community patch for 32 bit ARM machines. For our ARM images Ignition is currently the only way to configure the system, so we have active users for that architecture.

[jlebon]

Thanks!