Add WASI (WebAssembly) cross compile support #162

Job	Run time
build-test (ubuntu-latest, gcc, amd64)	20m 10s
build-test (ubuntu-latest, gcc, c)	25m 8s
build-test (ubuntu-latest, clang, amd64)	20m 36s
build-test (ubuntu-latest, clang, c)	29m 12s
build-test (ubuntu-latest, clang, llvm)	31m 23s
build-test (macos-13, gcc, amd64)	47m 12s
build-test (macos-13, gcc, c)	54m 12s
build-test (macos-13, clang, amd64)	47m 43s
build-test (macos-13, clang, c)	45m 37s
build-test (macos-13, clang, llvm)	51m 55s
build-test (windows-latest, gcc, amd64)	41m 54s
	6h 55m 2s

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