Cannot use Maven plugins that use slf4j-log4j12

If you try to use mvnd with a maven plugin that uses slf4j-log4j12, the build fails with

```
java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
at org.slf4j.impl.Log4jLoggerFactory.(Log4jLoggerFactory.java:54)
```

due to the presence of log4j-over-slf4j in the daemon classloader.

If I build a version of the daemon without the log4j-over-slf4j-dependency, everything seems to work fine, so that might be an easy fix, but it might be there for a reason?

Start by reproducing the mvnd build with a Maven plugin that uses slf4j-log4j12, then inspect the daemon classloader dependency that provides log4j-over-slf4j. Compare the behavior with a daemon built without that dependency; done means the plugin build succeeds without the SLF4J delegation-loop error.

Written by the indexing model from the issue text.