Build: Add version where missing from jar manifests

apps/desktopgui/build.xml

@@ -86,6 +86,8 @@
 		<jar basedir="${build}" excludes="messages-src/**" destfile="${dist}/${jar}">
 			<manifest>
 				<attribute name="Main-Class" value="net.i2p.desktopgui.Main"/>
+				<attribute name="Implementation-Version" value="${full.version}" />
+				<attribute name="Built-By" value="${build.built-by}" />
 				<attribute name="Build-Date" value="${build.timestamp}" />
 				<attribute name="Base-Revision" value="${workspace.version}" />
 				<attribute name="Workspace-Changes" value="${workspace.changes.tr}" />