Remove private/static markers from the pkg-config file

Remove private/static markers from the pkg-config file

Forwarded: no
Last-Update: 2023-06-21

The pkg-config file lists as as private the internal libraries used by exiv2.
The problem is that those private markers require the availability of those
other pkg-config files to make exiv2.pc usable; since those are needed only
for static linking, and that there are no static libraries, simply delete them
to make exiv2.pc usable again.

Gbp-Pq: Name pkgconfig-no-private.diff