vendor/box3d: support WASM atomics builds - #7287
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b3GetTicks and friends return zero on the generic branch, so World_GetProfile reports all zeroes on freestanding wasm32. Add a weak b3PlatformTicks that a host can override with a strong definition (monotonic microseconds); the weak default preserves the existing zero behaviour. Holding branch. Separate upstream concern from the mutex fix in box3d#124; no issue filed yet.
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Summary
atomicsfeature__wasm_atomics__is enabledDepends on #7286. Broader raw-WASM support belongs upstream in Box3D.
Related: erincatto/box3d#127
Testing
vendor/box3dforjs_wasm32with and without-target-features:atomics