build

jpeg: fix encoding several images successively #1491

Job	Run time
build (nothing)	45s
build (tarball, 1, 1, 1, 1, 1)	1m 23s
build (graphics, 1)	1m 4s
build (x265, 1)	1m 5s
build (x265 / graphics, 1, 1)	56s
build (libde265 (1) / graphics, 1, 1)	1m 6s
build (libde265 (2) / graphics, 1, 2)	3m 8s
build (libde265 (1) / x265 / graphics, 1, 1, 1)	1m 21s
build (libde265 (2) / x265 / graphics, 1, 1, 2)	4m 12s
build (libde265 (1) / x265 / aom / graphics, 1, 1, 1, 1)	1m 19s
build (libde265 (1) / x265 / dav1d / graphics, 1, 1, 1, 1)	3m 26s
build (libde265 (1) / x265 / aom / rav1e / graphics, 1, 1, 1, 1, 1)	19m 53s
	39m 38s

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