ignore test on wasm32

A fix applied to std::Path::hash triggers a miscompilation/assert in LLVM in this test on wasm32.
The miscompilation appears to pre-existing. Reverting some previous changes done std::Path also trigger it
and slight modifications such as changing the test path from "a" to "ccccccccccc" also make it pass, indicating
it's very flaky.
Since the fix is for a higher-tier platform than wasm it takes precedence.

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