nvidia hardware decoder support #2068

Job	Run time
build (nothing)	41s
build (tarball, 1, 1, 1, 1, 1)	1m 5s
build (graphics, 1)	49s
build (x265, 1)	54s
build (x265 / graphics, 1, 1)	53s
build (nvidia / graphics, 1, 1)	2m 49s
build (libde265 (1) / graphics, 1, 1)	1m 3s
build (libde265 (2) / graphics, 1, 2)	2m 21s
build (libde265 (1) / x265 / graphics, 1, 1, 1)	1m 10s
build (libde265 (2) / x265 / graphics, 1, 1, 2)	2m 32s
build (libde265 (1) / x265 / aom / graphics, 1, 1, 1, 1)	1m 11s
build (libde265 (1) / x265 / dav1d / graphics, 1, 1, 1, 1)	2m 8s
build (libde265 (1) / x265 / aom / rav1e / graphics, 1, 1, 1, 1, 1)	10m 3s
	27m 39s

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