I don't think you need this file in 1.10 sub project, you need an common/shared which should have such files, see the modules below for an example:
https://github.com/openmrs/openmrs-module-htmlformentry
https://github.com/openmrs/openmrs-module-webservices.rest
https://github.com/openmrs/openmrs-module-metadatasharing