8f4ac59f7c
This field's usage was removed with the brush assets project, previously it was used during runtime in the `PAINT_OT_brush_select` operator. This commit tags the DNA field as deprecated and marks the overall `brush.cc` file with `#define DNA_DEPRECATED_ALLOW` to follow a similar pattern as other BKE files dealing with I/O of ID types. The field was added in147b4b13baand updated in7b7aba31f2to prevent invalid pointers from remaining on the brush. Pull Request: https://projects.blender.org/blender/blender/pulls/138578