Merge branch 'master' of github.com:strukturag/libheif #1316

Job	Run time
build (nothing)	57s
build (tarball, 1, 1, 1, 1, 1)	1m 29s
build (graphics, 1)	54s
build (x265, 1)	1m 3s
build (x265 / graphics, 1, 1)	51s
build (libde265 (1) / graphics, 1, 1)	1m 10s
build (libde265 (2) / graphics, 1, 2)	4m 8s
build (libde265 (1) / x265 / graphics, 1, 1, 1)	1m 14s
build (libde265 (2) / x265 / graphics, 1, 1, 2)	3m 17s
build (libde265 (1) / x265 / aom / graphics, 1, 1, 1, 1)	1m 15s
build (libde265 (1) / x265 / dav1d / graphics, 1, 1, 1, 1)	2m 46s
build (libde265 (1) / x265 / aom / rav1e / graphics, 1, 1, 1, 1, 1)	19m 10s
	38m 14s

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