vdpau: Enable HEVC support based on working Nvidia driver versions

Patch
https://patchwork.ffmpeg.org/patch/4172/
has disabled use of HEVC by default with the generic hwaccel API if
it's the NVIDIA native implementation.

This is due to the retrieved decoded YUV data, or the surfaces mapped
with GL interop,results in interlacing artifacts with NVIDIA native
implementation

The issues of
 1)VDPAU H.265/HEVC read-back API causing interlaced artifacts

 2)HEVC VDPAU OpenGL interop having artifacts

Have been addressed in Nvidia driver releases 384.59 and 410.66
respectively.Hence Enabling the VDPAU HEVC support based on the Nvidia
driver version.

Author: ManojBonda

libavcodec/vdpau.c

@@ -208,8 +208,12 @@ int ff_vdpau_common_init(AVCodecContext *avctx, VdpDecoderProfile profile,
         return vdpau_error(status);
     if (avctx->codec_id == AV_CODEC_ID_HEVC && strncmp(info_string, "NVIDIA ", 7) == 0 &&
         !(avctx->hwaccel_flags & AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH)) {
-        av_log(avctx, AV_LOG_VERBOSE, "HEVC with NVIDIA VDPAU drivers is buggy, skipping.\n");
-        return AVERROR(ENOTSUP);
+        int driver_version;
+        sscanf(info_string, "NVIDIA VDPAU Driver Shared Library  %d", &driver_version);
+        if (driver_version < 410) {
+            av_log(avctx, AV_LOG_VERBOSE, "HEVC with NVIDIA VDPAU drivers is buggy, skipping.\n");
+            return AVERROR(ENOTSUP);
+        }
     }
 
     status = vdctx->get_proc_address(vdctx->device,