Remove obsolete print_meta_viewport function declaration

Normally wouldn't want to just remove obsolete functions, but realized
that becasue this doesn't have a function definition, it'll cause an
error if you try to use it. So you know, might as well get rid of
clutter from something that was so short-lived
Merge pull request #926 from afuna/remove-print_meta_viewport

Remove obsolete print_meta_viewport function declaration