gmplayer does not compile on NetBSD-current

[Martin Husemann <martin%duskware.de@localhost>]

Compiling multimedia/gmplayer on NetBSD-current fails with:

libvo/vo_x11.c: In function 'draw_slice':
libvo/vo_x11.c:495:27: warning: passing argument 2 of 'sws_scale' from incompat$
     sws_scale(swsContext, src, stride, y, h, dst, dstStride);
                           ^
In file included from libvo/vo_x11.c:53:0:
/usr/pkgobj/multimedia/gmplayer/work/.buildlink/include/ffmpeg3/libswscale/swsc$
 int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
     ^
libvo/vo_vdpau.c:131:8: error: unknown type name 'VdpPresentationQueueTargetCre$
 static VdpPresentationQueueTargetCreateX11       *vdp_presentation_queue_targe$
        ^
libvo/vo_vdpau.c: In function 'win_x11_init_vdpau_procs':
libvo/vo_vdpau.c:394:10: error: 'VDP_FUNC_ID_PRESENTATION_QUEUE_TARGET_CREATE_X$
         {VDP_FUNC_ID_PRESENTATION_QUEUE_TARGET_CREATE_X11,   
          ^
libvo/vo_vdpau.c:394:10: note: each undeclared identifier is reported only once$


Martin