Give control over native architecture
In QEMU, a maintained refreshed the dockerfiles from a macOS machine and unexpectedly libxen-dev and libpem-dev packages disappeared.
This showed two bugs
- QEMU needs the dockerfiles to always reflect x86_64 as a native arch, regardless of what the host arch of lcitool is
- lcitool was not canonicalizing 'arm64' to 'aarch64' to deal with macOS divergent arch name.
Edited by Daniel P. Berrangé