Remove docbook generation remains

New BIND no longer uses any part of docbook. It can handle out of tree
builds, therefore no hacks with copy back are required.

Documents should be installed just fine.

bind.spec

@@ -498,7 +498,7 @@ export LIBDIR_SUFFIX
 %configure \
   --with-python=%{__python3} \
   --with-libtool \
-  --localstatedir=/var \
+  --localstatedir=%{_var} \
   --with-pic \
   --disable-static \
   --includedir=%{_includedir}/bind9 \
@@ -531,7 +531,6 @@ export LIBDIR_SUFFIX
   --with-cmocka \
 %endif
   --enable-fixed-rrset \
-  --with-docbook-xsl=%{_datadir}/sgml/docbook/xsl-stylesheets \
   --enable-full-report \
 ;
 %if %{with DNSTAP}
@@ -554,13 +553,6 @@ fmtutil-user --missing || :
 
 %make_build
 
-### FIXME hack!!!
-### xsltproc doesn't find properly configured files
-### and use ones from source tree
-### copy generated files to the original location
-cp -rv doc/* ../doc/
-
-
 # Regenerate dig.1 manpage
 pushd bin/dig
 make man