Update WASI to 0.12.0 (#224) #750

Job	Run time
parsecheck	29s
lint	36s
build_interface (ubuntu-latest)	27s
build-zware-gen (ubuntu-latest)	24s
source-code-tests (ubuntu-latest)	28s
build_interface (macos-latest)	1m 35s
build-zware-gen (macos-latest)	1m 35s
source-code-tests (macos-latest)	1m 40s
testsuite (ubuntu-latest)	28s
build_interface (windows-latest)	1m 45s
build-zware-gen (windows-latest)	2m 3s
source-code-tests (windows-latest)	1m 43s
testsuite (macos-latest)	1m 42s
testsuite (windows-latest)	1m 19s
fib (ubuntu-latest)	25s
fib (macos-latest)	1m 37s
fib (windows-latest)	1m 17s
	19m 33s

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