Incorrectly flags build profile restrictions as invalid in Depends

[nthykier]

I did an arch:all package where I had a dependency (Depends) contain a build-profile constraint. The plugin classifies this as an error in the dependency field, but the build succeeded and the constraint was resolved (causing it to be conditionally optional).

The plugin should not flag build profile restrictions as invalid for Depends (and probably not Recommends and Suggests either, but I did not check those at the time)