add dr_12.h to dr.h
add dr_12.h to dr.h

Signed-off-by: Jean-Paul Saman <c35aa29dc4eb008b34a9adceca7414ea1db124ba@videolan.org>

paraeco/libdvbpsi,mkrufky/libdvbpsi,mwgoldsmith/dvbpsi,paraeco/libdvbpsi,vlc-mirror/libdvbpsi,vlc-mirror/libdvbpsi,vlc-mirror/libdvbpsi,paraeco/libdvbpsi,mkrufky/libdvbpsi,mwgoldsmith/dvbpsi,paraeco/libdvbpsi,mkrufky/libdvbpsi,mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi