build: enable maglev for Linux on s390x #1255

Job	Run time
Build slim tarball	1m 32s
x86_64-linux: with shared libraries	29m 7s
aarch64-linux: with shared libraries	23m 38s
aarch64-darwin: with shared libraries	29m 0s
x86_64-darwin: with shared libraries	42m 29s
	2h 5m 46s

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