Add o.e.pde.spies feature to eclipse/updates repo

With eclipse-pde/eclipse.pde#479 the PDE-spies
have been moved into a dedicated feature, which has to be added to the
eclipse/updates p2-repo.

eclipse.platform.releng.tychoeclipsebuilder/eclipse.platform.repository/category.xml

@@ -40,6 +40,8 @@
    <feature id="org.eclipse.ecf.filetransfer.httpclient5.feature.source" version="0.0.0"/>
    <feature id="org.eclipse.ecf.filetransfer.ssl.feature" version="0.0.0"/>
    <feature id="org.eclipse.ecf.filetransfer.ssl.feature.source" version="0.0.0"/>
+   <feature id="org.eclipse.pde.spies"/>
+   <feature id="org.eclipse.pde.spies.source"/>
    <bundle id="org.eclipse.jdt.core.compiler.batch" version="0.0.0"/>
    <bundle id="org.eclipse.e4.ui.progress"/>
    <bundle id="org.eclipse.e4.ui.progress.source"/>