build

jpeg2000: add encoding of alpha channel #1492

Job	Run time
build (nothing)	46s
build (tarball, 1, 1, 1, 1, 1)	1m 9s
build (graphics, 1)	44s
build (x265, 1)	1m 26s
build (x265 / graphics, 1, 1)	1m 13s
build (libde265 (1) / graphics, 1, 1)	1m 10s
build (libde265 (2) / graphics, 1, 2)	3m 1s
build (libde265 (1) / x265 / graphics, 1, 1, 1)	1m 28s
build (libde265 (2) / x265 / graphics, 1, 1, 2)	3m 49s
build (libde265 (1) / x265 / aom / graphics, 1, 1, 1, 1)	1m 43s
build (libde265 (1) / x265 / dav1d / graphics, 1, 1, 1, 1)	3m 30s
build (libde265 (1) / x265 / aom / rav1e / graphics, 1, 1, 1, 1, 1)	15m 22s
	35m 21s

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