When the pmaport arch does not match, but there's a matching binary
package, return the binary package instead of the pmaport.
This is needed to fix "pmbootstrap repo_missing" for x86_64
networkmanager-qt, which indirectly depends on mesa (and mesa needs to
be taken from the binary packages for x86_64, not from the pmaports,
see #1741).
45c9eaa3ea