JavaScript linker: add wasm flag #2879

Job	Run time
lint-opam	3m 56s
lint-fmt	2m 40s
build (ubuntu-latest, 4.08, true, true, true)	3m 13s
build (ubuntu-latest, 4.09, true, true, true)	3m 18s
build (ubuntu-latest, 4.10, true, true, true)	3m 35s
build (ubuntu-latest, 4.11, true, true, true)	3m 8s
build (ubuntu-latest, 4.12, true, true, true)	3m 9s
build (ubuntu-latest, 4.13, true, true, true)	3m 20s
build (ubuntu-latest, 5.0, true, true, true)	3m 13s
build (ubuntu-latest, 5.1, true, true, true)	3m 47s
build (ubuntu-latest, 4.14, true, false, true)	7m 17s
build (macos-latest, 4.14, true, false, true)	10m 27s
build (windows-latest, 4.14, true, false, true)	16m 34s
build (ubuntu-latest, 5.2, false, false, false)	11m 25s
build (macos-latest, 5.2, true, false, true)	8m 21s
build (windows-latest, 5.2, false, false, true)	23m 13s
	1h 50m 36s

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