Consider to add classes from "org.apache.log4j.varia" of log4j 1.x to "log4j-1.2-api" bridge

I'm using Log4J 2.x for tests of my application.
But several tests depends on external library that not under my control.
And that library is using log4j 1.x.
So, I added to classpath log4j-1.2-api and everything ALMOST start working, except that compilation failed with "Class not found of org.apache.log4j.varia.LevelRangeFilter".

So, I simply "copy-pasted" that class to my test and everything start working as expected.

I think that classes from "org.apache.log4j.varia" package can be added to log4j-1.2-api