vaapi: we don't need SSE intrinsics with the new API

libavutil does this for us. Although the new vaapi decode API does not
strictly introduce or even need av_image_copy_uc_from(), it's implied
that it will be present if the new decode API is present - even if it's
not, we can't use our own SSE code with it anyway.

wscript

@@ -888,7 +888,7 @@ hwaccel_features = [
     }, {
         'name': 'sse4-intrinsics',
         'desc': 'GCC SSE4 intrinsics for GPU memcpy',
-        'deps_any': [ 'd3d-hwaccel', 'vaapi-hwaccel' ],
+        'deps_any': [ 'd3d-hwaccel', 'vaapi-hwaccel-old' ],
         'func': check_cc(fragment=load_fragment('sse.c')),
     }
 ]