fs: expose frsize field in statfs results #4825

Job	Run time
Build slim tarball	2m 9s
aarch64-darwin: with shared libraries	2m 48s
aarch64-linux: with shared libraries	1m 14s
x86_64-darwin: with shared libraries	3m 35s
x86_64-linux: with shared libraries	1m 35s
	11m 21s

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