vlc_codecs: add WAVEFORMATEXTENSIBLE_IEC61937
vlc_codecs: add WAVEFORMATEXTENSIBLE_IEC61937

This will be used by wasapi for EAC3, MLP, TRUEHD...

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc