Automatically let 'javaModulesMergeJars' extend 'internal' if it exists

[jjohannes]

jvm-dependency-conflict-resolution creates a Configuration called internal if a platform is used for version management in combination with consisten resolution. Automatically make this versions available for dependencies that are only resolved in the "Jar Merge".

configurations.javaModulesMergeJars { extendsFrom(configurations["internal"]) }