Bitcode isn’t currently supported, you can turn it off in the build settings. There are a few threads about this here.
Please search for some of the troubleshooting threads about linker errors for plugins, this has been diagnosed a few times here. Usually a step was missed from the instructions or tutorial, or a step was taken which isn’t in the OpenEars docs and isn’t helpful, from an external source like Stack Overflow. It isn’t related to order of headers.