build: enable maglev for Linux on s390x #1213

Job	Run time
Build slim tarball	1m 29s
x86_64-linux: with shared libraries	29m 37s
aarch64-darwin: with shared libraries	28m 49s
x86_64-darwin: with shared libraries	50m 17s
aarch64-linux: with shared libraries	25m 5s
	2h 15m 17s

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