[RFA/JDWP] VMVirtualMachine StringBuffer cleanup

[Andrew Haley]

Keith Seitz writes:
 > Hi,
 > 
 > I've been meaning to cleanup a lot of the gnu/classpath/jdwp/nat*.cc 
 > files, and this is one of the things that made it onto my pet peeve list 
 > recently. The attached patch switches to the 
 > gnu.gcj.runtime.StringBuffer instead of the java.lang one.
 > 
 > I've got some other little cleanups that I'll submit after this.

I'm doing a big merge from trunk -> branch.  Please don't commit
anything to trun ATM.

Andrew.