Some modifications towards Harbour

• Harbour rpm validator CI test
  • Somehow allow CI-named RPMs (bXXXX.commit is apparently disallowed by the script, but we wouldn't have that on harbour anyway) https://github.com/sailfishos/sdk-harbour-rpmvalidator/blob/master/rpmvalidation.sh#L828 -> #348
• Fix-up as many RPM-spec things as we can already.
• Add a harbour-specific build to CI, that excludes the daemon etc. -> #347

Moving towards #144 (closed)