core: Fix parallel build
core: Fix parallel build

Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,jku/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,GNOME/rygel,Tarnyko/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched