Original commit message from CVS:
* docs/plugins/inspect/plugin-dvdnav.xml:
* docs/plugins/inspect/plugin-realmedia.xml:
* docs/plugins/inspect/plugin-synaesthesia.xml:
Add inspect file for synaesthesia so the docs can be built even if
the plugin isn't built yet. Fixes#454311. Also add inspect files
for dvdnavsrc and realmedia.