050b205a97
Unity builds are only used in the `bf_nodes_geometry` module for now. This module has been prepared to support unity builds already. Usually, there is a 2-4x speedup when building `bf_nodes_geometry` compared to without unity builds (e.g. 145s to 55s). For more information about how unity builds work and how they help with compile times, see D13341. Differential Revision: https://developer.blender.org/D13341