fix(MMDPhysics): vendor ammo

[CodyJasonBennett]

Fixes #9

I've tracked down the used version of Ammo to either from https://github.com/mrdoob/three.js/commit/9e2cea0fd32dfbfb1a023aced06649cb48b6037c, so I've opted to use the more portable version.

[codesandbox-ci[bot]]

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