video: remove old vdpau hwaccel API usage

While the "old" libavcodec vdpau API is not deprecated (only the very-
old API is), it's still relatively complicated code that badly
duplicates the much simpler newer vdpau code. It exists only for the
sake of older FFmpeg releases; get rid of it.

wscript

@@ -753,14 +753,6 @@ hwaccel_features = [
         'func': check_statement('libavcodec/vdpau.h',
                                 'av_vdpau_bind_context(0,0,0,AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH)',
                                 use='libav'),
-    }, {
-        'name': '--vdpau-old-hwaccel',
-        'desc': 'libavcodec VDPAU hwaccel (old API)',
-        'deps': [ 'vdpau' ],
-        'deps_neg': [ 'vdpau-hwaccel' ],
-        'func': check_statement('libavcodec/vdpau.h',
-                                'av_vdpau_alloc_context()',
-                                use='libav'),
     }, {
         'name': '--dxva2-hwaccel',
         'desc': 'libavcodec DXVA2 hwaccel',

wscript_build.py

@@ -294,7 +294,6 @@ def build(ctx):
         ( "video/decode/vda.c",                  "vda-hwaccel" ),
         ( "video/decode/videotoolbox.c",         "videotoolbox-hwaccel" ),
         ( "video/decode/vdpau.c",                "vdpau-hwaccel" ),
-        ( "video/decode/vdpau_old.c",            "vdpau-old-hwaccel" ),
         ( "video/filter/vf.c" ),
         ( "video/filter/vf_buffer.c" ),
         ( "video/filter/vf_crop.c" ),