* apt-pkg/cacheiterators.h:

* apt-pkg/cacheiterators.h:
  - return the correct version arch for all+foreign, too

The flag is interpreted at a few other places in different styles so
this commit ensures that the flag check is consistent everywhere
(checking for Same in flag style is a bit too much as it isn't used
 in combination with others anyway, but who knows and just for
 consistency)