This fixes the following failure when doing a clean build (in particular
no .ninja* lying around) of lib/libMLIRTilingInterface.a only:
```
In file included from mlir/include/mlir/Interfaces/TilingInterface.h:17,
from mlir/lib/Interfaces/TilingInterface.cpp:13:
mlir/include/mlir/Dialect/Utils/StructuredOpsUtils.h:27:10: fatal error: mlir/Dialect/Utils/DialectUtilsEnums.h.inc: No such file or directory
```