Remove obsolete WASI Node flag #785

Job	Run time
ci-data	4s
Push source gem	-1s
Compile native gem for x86_64-linux	10m 56s
Compile native gem for x86_64-darwin	6m 43s
Compile native gem for aarch64-linux	6m 51s
Compile native gem for arm64-darwin	6m 48s
Compile native gem for aarch64-linux-musl	6m 52s
Compile native gem for x86_64-linux-musl	6m 56s
Compile native gem for x64-mingw-ucrt	6m 53s
	52m 2s

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