Remove the mkdir of the parent Directories for protobufs.

			var stagedProtoSrcs android.Paths

			for _, srcFile := range protoSrcs {

				stagedProtoSrc := pkgPathStagingDir.Join(ctx, pkgPath, srcFile.Rel())

				rule.Command().Text("mkdir -p").Flag(filepath.Base(stagedProtoSrc.String()))

				rule.Command().Text("cp -f").Input(srcFile).Output(stagedProtoSrc)

				stagedProtoSrcs = append(stagedProtoSrcs, stagedProtoSrc)

			}