vendor/box3d: add a fallback platform clock hook - #7286
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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
This is intentionally limited to the timer hook. Broader raw-WASM support belongs upstream in Box3D.
Related: erincatto/box3d#127
Testing
./odin build vendor/box3d -target:js_wasm32 -build-mode:obj