Fix FTBFS bug (bz1923686)

libgta.spec

@@ -1,6 +1,6 @@
 Name:      libgta
 Version:   1.2.1
-Release:   2%{?dist}
+Release:   3%{?dist}
 Summary:   Library that implements the Generic Tagged Arrays file format
 License:   LGPLv2+
 URL:       https://marlam.de/gta/
@@ -67,10 +67,12 @@ rm -rf %{buildroot}%{_docdir}
 
 %files doc
 %doc doc/example*
-%doc doc/reference
 
 
 %changelog
+* Wed May 19 2021 Jiri Kucera <jkucera@redhat.com> - 1.2.1-3
+- Fix FTBFS (bz1923686)
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.2.1-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild