Build: Add back the old, slow way to build bundles

for gettext < 0.19

apps/susimail/build.xml

@@ -100,6 +100,7 @@
     </target>
 
     <target name="bundle" depends="compile" unless="no.bundle">
+        <mkdir dir="build/messages-src" />
         <!-- Update the messages_*.po files.
              We need to supply the bat file for windows, and then change the fail property to true -->
         <exec executable="sh" osfamily="unix" failifexecutionfails="true" failonerror="${require.gettext}" >