Make CI (for WebAssembly)

- clean up `extern` keyword #463

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Run time

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Job	Run time
build-wasm (halfkp)	5m 2s
build-wasm (halfkp.noeval)	2m 29s
build-wasm (halfkpe9.noeval)	2m 30s
build-wasm (halfkpvm.noeval)	2m 27s
build-wasm (k-p)	2m 29s
build-wasm (k-p.noeval)	2m 30s
build-wasm (material)	2m 24s
build-wasm (material9)	2m 26s
build-wasm (yaneuraou-mate)	2m 38s
build-wasm (tanuki-mate)	2m 22s
	27m 17s