Update wasi-libc submodule (#599) #1095

Job	Run time
Build only sysroot - default	18m 3s
Build only sysroot - exceptions	17m 26s
Build arm64-macos	22m 4s
Build x86_64-linux	26m 19s
Build x86_64-windows	46m 46s
Build x86_64-macos	6m 39s
Build arm64-windows	1h 46m 21s
Build arm64-linux	17m 8s
Finalize wasi-sdk artifacts	10m 3s
Test standalone toolchain	3m 47s
	4h 34m 36s

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