[Bug 793989] pkgconfig: Add private zlib dependency for libgsttag

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793989

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 369188
  --> https://bugzilla.gnome.org/attachment.cgi?id=369188&action=edit
pkgconfig: Add private zlib dependency for libgsttag

Fixes issues with static application builds (which might not know
they need to link with zlib when using a libgsttag that was compiled
with it).

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