Exclude semanticdb-scalac-core from semanticdb-scalac.
Exclude semanticdb-scalac-core from semanticdb-scalac.

The pomPostProcess no longer worked after #1159.
This change was manually tested locally and the .pom now correctly
excludes the semanticdb dependency.

MasseGuillaume/scalameta,MasseGuillaume/scalameta,xeno-by/scalameta,xeno-by/scalameta,scalameta/scalameta,scalameta/scalameta,xeno-by/scalameta,DavidDudson/scalameta,scalameta/scalameta,MasseGuillaume/scalameta,olafurpg/scalameta,scalameta/scalameta,olafurpg/scalameta,scalameta/scalameta,DavidDudson/scalameta,olafurpg/scalameta