Performing incremental compiles in make/sun/xawt on Linux can be frustratingly
slow because the WrapperGenerator and other XAWT classes are compiled everytime
around. This apparently is only a problem on Linux; I've verified that on
Solaris those classes are only recompiled as they are required.

This problem should be fixed so that incremental compiles of XAWT on Linux work
as they do on Solaris.