lavc/rkmppenc: add RKMPP MJPEG/JPEG encoder #721

Job	Run time
build_portable_windows / Build Portable FFmpeg (win64)	37m 45s
build_portable_mac / Build Portable FFmpeg (macos-12, x86_64)	1h 7m 59s
build_portable_linux / Build Portable FFmpeg (amd64)	1h 41m 21s
build_portable_mac / Build Portable FFmpeg (macos-14, arm64)	46m 6s
build_debian / Build FFmpeg (buster, amd64)	51m 55s
build_portable_linux / Build Portable FFmpeg (arm64)	1h 32m 14s
build_debian / Build FFmpeg (buster, arm64)	15m 30s
build_ubuntu / Build FFmpeg (focal, amd64)	13m 42s
build_debian / Build FFmpeg (buster, armhf)	14m 20s
build_ubuntu / Build FFmpeg (focal, arm64)	13m 43s
build_debian / Build FFmpeg (bullseye, amd64)	48m 33s
build_ubuntu / Build FFmpeg (focal, armhf)	10m 39s
build_debian / Build FFmpeg (bullseye, arm64)	12m 9s
build_ubuntu / Build FFmpeg (jammy, amd64)	13m 45s
build_debian / Build FFmpeg (bullseye, armhf)	10m 59s
build_ubuntu / Build FFmpeg (jammy, arm64)	12m 23s
build_debian / Build FFmpeg (bookworm, amd64)	55m 29s
build_ubuntu / Build FFmpeg (jammy, armhf)	11m 47s
build_debian / Build FFmpeg (bookworm, arm64)	11m 48s
build_ubuntu / Build FFmpeg (noble, amd64)	2m 44s
build_debian / Build FFmpeg (bookworm, armhf)	10m 51s
build_ubuntu / Build FFmpeg (noble, arm64)	2m 29s
build_ubuntu / Build FFmpeg (noble, armhf)	2m 38s
build_ubuntu / Publish Release	0s
build_portable_windows / Publish Portable Release	0s
build_debian / Publish Release	0s
build_portable_mac / Publish Portable Release	0s
build_portable_linux / Publish Portable Release	0s
	11h 0m 49s

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