these actions are kind of "meta" actions, combining getpkgdepname and
getpkgname (and the respective version actions) so that a list of mixed
pkgvers and package patterns can be interpreted. This uses the internal
format check of `xbps_pkgpattern_{name,version}()` to allow for a
fallback to `xbps_pkg_{name,version}()` for exact versions, then falls
back to displaying an error message if that also fails.
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