Don't override the architecture field in manifest without checking
No builder should simply override the any manifest fields. This results in weird issues similar to ubports/apps/calendar-app#187. One can set e.g. architecture
field in manifest to @CLICK_ARCH@
to set it automatically. If it is set to something incorrect, this is a mistake that should be rejected.
Solves #181 (closed)
Edited by Jonatan Hatakeyama Zeidler