taglib-1.7: shlib minor decreased

[Thomas Klausner]

Hi!

When building taglib-1.7 on NetBSD-5.99.48/amd64, I found that the
shared library is now "libtag.so.1.7.0".
When building the previous version, 1.6.3, the shared library was
"libtag.so.1.9.0".

So effectively, this was a library downgrade. Could you please fix it
and bump the version installed by 1.7?

Thanks,
 Thomas