I'm actually not very sure if we should skip packages according to architecture.
I'd rather not trust the creator of the pkgbuild (since this is aur and not an "official" repo) and check all packages.

We do already sort a lot of files out and check the remaining ones via line 45/52 which does a quite good job I think.
Of my 59 local packages 24 are skipped but it only saves around 2 seconds (performance goes from 31 seconds to 29)