wasm-pack fails to locate wasm-opt in PATH

[Erk-]

🐛 Bug description

wasm-pack does not search PATH for wasm-opt, at least not on targets where there is no prebuilt binary

🤔 Expected Behavior

wasm-pack should find wasm-opt in PATH

👟 Steps to reproduce

Not sure if this is specific to FreeBSD or if it also happens on other operating systems.

• run wasm-pack
• observe it fails because wasm-opt is not available
• install wasm-opt
• run wasm-pack
• observe that it does not find wasm-opt even though it is in path.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.9.1
rustc version: 1.44.1 (FreeBSD ports version)
FreeBSD version: FreeBSD 12.1-RELEASE-p3 GENERIC amd64
wasm-opt version: 93

Same for me (on Fedora). I believe it does not search for wasm-opt at all. The comment above that finding function seems to be out of date, and the function itself seems not to be complete.
Edit: It used to find it, but not anymore after #687.

[ctron]

This is pretty annoying as the download for wasm-opt fails now on linux (amd64)

[drager]

Please try out v0.12.0 from one of the following ways:

• https://github.com/rustwasm/wasm-pack/releases/tag/v0.12.0
• https://crates.io/crates/wasm-pack/0.12.0
• https://www.npmjs.com/package/wasm-pack/v/0.12.0