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Install Temurin JDK 11 from external repository in dockcross images #94

Job	Run time
windows (aarch64)	2m 30s
ubuntu (x86, g++-multilib)	28s
windows (x86_64)	2m 35s
macos (aarch64)	58s
ubuntu (x86_64, g++-)	42s
macos (x86_64)	22s
ubuntu (armhf, g++-arm-linux-gnueabihf)	32s
ubuntu (aarch64, g++-aarch64-linux-gnu)	34s
ubuntu (riscv64, g++-riscv64-linux-gnu)	28s
ubuntu (ppc64, g++-powerpc64le-linux-gnu)	40s
ubuntu (mingw32, g++-mingw-w64-i686)	31s
ubuntu (mingw64, g++-mingw-w64-x86-64)	33s
ubuntu (mingwaarch64, clang)	56s
	11m 49s

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