Include backward compatible html symlink in doc subpackage

(cherry picked from commit dc4646b7fd6ec1409c06c67043928274a41e26a0)

Related: rhbz#1956777

bind.spec

@@ -51,7 +51,7 @@ Summary:  The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
 Name:     bind
 License:  MPLv2.0
 Version:  9.16.19
-Release:  2%{?dist}
+Release:  3%{?dist}
 Epoch:    32
 Url:      https://www.isc.org/downloads/bind/
 #
@@ -730,6 +730,8 @@ popd
 mkdir -p ${RPM_BUILD_ROOT}%{_pkgdocdir}
 cp -a build/doc/arm/_build/html ${RPM_BUILD_ROOT}%{_pkgdocdir}
 rm -rf ${RPM_BUILD_ROOT}%{_pkgdocdir}/html/.{buildinfo,doctrees}
+# Backward compatible link to 9.11 documentation
+(cd ${RPM_BUILD_ROOT}%{_pkgdocdir} && ln -s html/index.html Bv9ARM.html)
 # Share static data from original sphinx package
 for DIR in %{python3_sitelib}/sphinx_rtd_theme/static/*
 do
@@ -1118,6 +1120,7 @@ fi;
 %if %{with DOC}
 %files doc
 %dir %{_pkgdocdir}
+%doc %{_pkgdocdir}/Bv9ARM.html
 %doc %{_pkgdocdir}/html
 %endif
 %if %{with DOCPDF}
@@ -1125,6 +1128,9 @@ fi;
 %endif
 
 %changelog
+* Fri Jul 23 2021 Petr Menšík <pemensik@redhat.com> - 32:9.16.19-3
+- Include backward compatible html symlink in doc subpackage
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 32:9.16.19-2
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688