Removes unnecessary usages of the following headers: - BKE_gpencil_geom_legacy.h - BKE_gpencil_legacy.h - BKE_gpencil_modifier_legacy.h - BKE_grease_pencil_legacy_convert.hh - DNA_gpencil_legacy_types.h Pull Request: https://projects.blender.org/blender/blender/pulls/141471