build: add `--shared-nbytes` configure flag #2230

Job	Run time
Build slim tarball	1m 34s
x86_64-darwin: with shared libraries	2h 46m 20s
aarch64-darwin: with shared libraries	1h 44m 22s
x86_64-linux: with shared libraries	1h 30m 31s
aarch64-linux: with shared libraries	55m 28s
	6h 58m 15s

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