Add WASI (WebAssembly) cross compile support #170

Job	Run time
build-test (ubuntu-latest, gcc, amd64)	20m 14s
build-test (ubuntu-latest, gcc, c)	24m 50s
build-test (ubuntu-latest, clang, amd64)	20m 47s
build-test (ubuntu-latest, clang, c)	29m 7s
build-test (ubuntu-latest, clang, llvm)	31m 21s
build-test (macos-13, gcc, amd64)	46m 59s
build-test (macos-13, gcc, c)	48m 59s
build-test (macos-13, clang, amd64)	44m 54s
build-test (macos-13, clang, c)	52m 28s
build-test (macos-13, clang, llvm)	52m 13s
build-test (windows-latest, gcc, amd64)	41m 8s
	6h 53m 0s

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