BSE: SF2: remove extern "C" from header
BSE: SF2: remove extern "C" from header

Signed-off-by: Stefan Westerfeld <eb0877843acc39f8ef6f7269937dee931c372d23@space.twc.de>

GNOME/beast,swesterfeld/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,GNOME/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,GNOME/beast,tim-janik/beast,swesterfeld/beast,GNOME/beast,swesterfeld/beast,GNOME/beast,GNOME/beast,tim-janik/beast,swesterfeld/beast,GNOME/beast