JavaHL: Use the updated Pool class for subpools as well.  Followup to r24541.
JavaHL: Use the updated Pool class for subpools as well.  Followup to r24541.

Because Pool objects have the lifetime of their enclosing block, they will
automagically get destroyed when that block ends, so both the parent pool, and
any other pools declared in that function, will get destroyed.

* subversion/bindings/javahl/native/SVNAdmin.cpp:
  (deltify, rmtxns, rmlocks): Use Pool object for subpools.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion