Disable building of export-libs

DHCP no longer needs export libs, stop building them.

bind.spec

@@ -19,7 +19,7 @@
 %bcond_without JSON
 %bcond_without DNSTAP
 %bcond_without DLZ
-%bcond_without EXPORT_LIBS
+%bcond_with    EXPORT_LIBS
 # Legacy GeoIP support
 %bcond_with    GEOIP
 # New MaxMind GeoLite support
@@ -820,14 +820,16 @@ sed -e "/^\s*include(/ d" -e 's/^-- use //' \
   fi;
   popd
 
-  pushd export-libs
-  make unit
-  e=$?
-  if [ "$e" -ne 0 ]; then
-    echo "ERROR: this build of BIND export-libs failed 'make unit'. Aborting."
-    exit $e;
-  fi;
-  popd
+  %if %{with EXPORT_LIBS}
+    pushd export-libs
+    make unit
+    e=$?
+    if [ "$e" -ne 0 ]; then
+      echo "ERROR: this build of BIND export-libs failed 'make unit'. Aborting."
+      exit $e;
+    fi;
+    popd
+  %endif
 
 %endif
 
@@ -1540,6 +1542,7 @@ fi;
 * Wed Jul 24 2019 Petr Menšík <pemensik@redhat.com> - 32:9.11.9-1
 - Update to 9.11.9
 - Add GeoLite2 support
+- Disable export-libs
 
 * Wed Jul 24 2019 Petr Menšík <pemensik@redhat.com> - 32:9.11.8-2
 - Use monotonic time in export library (#1732883)