Out-of-box multiarchitecture support

[arcan1s]

Feature summary

Key point of this feature is to provide non-amd64 architecture out of the box without needs to edit stock PKGBUILDs

Cause of the feature request

Since I personally never used other than x86_64 architecture, I actually never tested application in this way. However it makes sense to just skip architecture check and let maintainer decide should this package be built under the specified architecture or not.

Proposed changes and/or features

Patching PKGBUILD in memory? Or maybe just skip architecture check somehow. Actually at first this feature needs closer look, it might already work as expected thanks to devtools