build

fix reading images with unspecified jpgC box #1487

Job	Run time
build (nothing)	43s
build (tarball, 1, 1, 1, 1, 1)	1m 8s
build (graphics, 1)	49s
build (x265, 1)	1m 1s
build (x265 / graphics, 1, 1)	1m 3s
build (libde265 (1) / graphics, 1, 1)	1m 12s
build (libde265 (2) / graphics, 1, 2)	2m 56s
build (libde265 (1) / x265 / graphics, 1, 1, 1)	1m 13s
build (libde265 (2) / x265 / graphics, 1, 1, 2)	4m 35s
build (libde265 (1) / x265 / aom / graphics, 1, 1, 1, 1)	1m 12s
build (libde265 (1) / x265 / dav1d / graphics, 1, 1, 1, 1)	3m 35s
build (libde265 (1) / x265 / aom / rav1e / graphics, 1, 1, 1, 1, 1)	16m 18s
	35m 45s

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