Prepare plugin-meta-data config-dir and files

tools/linux_packaging/build

@@ -186,6 +186,7 @@ Backends=$APPLIB/backends
 
 Themes=$Shared/themes
 Templates=$Shared/templates
+PluginMetadata=$Shared/plugin_metadata
 ExportFormats=$Shared/export
 Locale=$Shared/locale
 MidiMaps=$Shared/midi_maps
@@ -400,6 +401,9 @@ done
 #Session templates
 cp -av $BUILD_ROOT/../templates $Templates
 
+# PluginMetadata
+cp -av $BUILD_ROOT/../plugin_metadata $PluginMetadata
+
 # ExportFormats
 # got to be careful with names here
 for x in $BUILD_ROOT/../export/*.preset $BUILD_ROOT/../export/*.format ; do