Double precision Bullet3 is now a hard requirement for OpenMW 0.47.0.
Note: while OpenMW is hardcoded to use specific precision (float in pre-0.47 releases and double in 0.47 and future releases), the build system of Godot adapts to precision of the provided build, so it should rebuild normally.

1. Built and tested openmw 0.47.0 against it.
2. Rebuilt godot.