Make ARM build pass on EPEL8

More issues is reported on EPEL8. Still build documentation on it, but
do not require no warnings during the process.

bind9-next.spec

@@ -375,11 +375,15 @@ CPPFLAGS="$CPPFLAGS -DOPENSSL_API_COMPAT=10100"
 export CFLAGS CPPFLAGS
 export STD_CDEFINES="$CPPFLAGS"
 
-
 sed -i -e \
 's/([bind_VERSION_EXTRA],\s*\([^)]*\))/([bind_VERSION_EXTRA], \1-RH)/' \
 configure.ac
 
+%if 0%{?rhel} && 0%{?rhel} < 9
+# disable Sphinx warnings as errors, epel8 does not pass cleanly
+sed -e 's/-W\s//' -i Makefile.docs
+%endif
+
 autoreconf --force --install
 
 mkdir build