tools: make `v8.nix` more stable #5012

Job	Run time
Build slim tarball	2m 8s
x86_64-darwin: with shared libraries	2h 39m 37s
aarch64-linux: with shared libraries	1h 21m 26s
aarch64-darwin: with shared libraries	1h 38m 55s
x86_64-linux: with shared libraries	1h 50m 29s
	7h 32m 35s

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