Handle wasm archive target names

[danielraffel]

Newer Skia wasm builds expose archive targets with a .wasm.a suffix, while this package still publishes the usual lib*.a filenames.

This keeps those two names separate:

• Ninja builds the wasm-specific target name
• packaging still writes the existing library filename

The existing Windows .lib target-name rule now goes through the same helper, so the platform-specific naming rules are in one place.

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[danielraffel]

I noticed #7 already includes the wasm target-name handling, so I'm closing this one to avoid duplicating the same change. The branch can still be useful as a small reference if you want the wasm bit separated.