Add support to print help/usage of util.parseArgs #536

Job	Run time
Build slim tarball	1m 29s
aarch64-darwin: with shared libraries	32m 46s
x86_64-linux: with shared libraries	1h 9m 41s
aarch64-linux: with shared libraries	1h 1m 1s
x86_64-darwin: with shared libraries	1h 3m 0s
	3h 47m 57s

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