watch: re-expose watch flags via execArgv #794

Job	Run time
Build slim tarball	1m 30s
x86_64-linux: with shared libraries	28m 19s
aarch64-darwin: with shared libraries	30m 9s
aarch64-linux: with shared libraries	24m 9s
x86_64-darwin: with shared libraries	46m 15s
	2h 10m 22s

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