android: support cross-compiling #6247

Job	Run time
Build slim tarball	4m 2s
collect-openssl-versions	9s
aarch64-linux: Cache V8 build	6m 33s
x86_64-darwin: with shared libraries	6m 43s
x86_64-linux: with shared libraries	6m 33s
aarch64-darwin: with shared libraries	6m 36s
aarch64-linux: with shared ${{ matrix.openssl.attr }} (${{ matrix.openssl.version }})	1s
	30m 37s

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