build: enable Maglev for riscv64 #5086

Job	Run time
Build slim tarball	2m 1s
x86_64-linux: with shared libraries	1h 50m 24s
x86_64-darwin: with shared libraries	3h 4m 56s
aarch64-linux: with shared libraries	1h 19m 51s
aarch64-darwin: with shared libraries	1h 52m 18s
	8h 9m 30s

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