fix: allow compiling to wasm32-wasi

[fibonacci1729]

This fixes a type mismatch when compiling wasm-opt targeting wasm32-wasi.

error[E0308]: mismatched types
   --> wasm-opt-0.116.0/src/base.rs:397:8
    |
397 |     Ok(path)
    |     -- ^^^^ expected `&[u8]`, found `&Path`
    |     |
    |     arguments to this enum variant are incorrect
    |
    = note: expected reference `&[u8]`
               found reference `&Path`

cc @alexcrichton

[alexcrichton]

👋 @brson long time no see!

[brson]

Thanks @fibonacci1729 @alexcrichton I'll aim to get this into a point release this weekend.

[brson]

Looks like the CI failure is unrelated.

[brson]

This is published as 0.116.1