build: add `--shared-nbytes` configure flag #2198

Job	Run time
Build slim tarball	1m 43s
aarch64-darwin: with shared libraries	1h 7m 4s
x86_64-linux: with shared libraries	1h 4m 46s
x86_64-darwin: with shared libraries	1h 18m 51s
aarch64-linux: with shared libraries	57m 25s
	4h 29m 49s

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