Follow-up to r1582341: More fixes.

* subversion/tests/libsvn_subr/packed-data-test.c
  (test_data): Use APR constants and macros for constant definition.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1582367 13f79535-47bb-0310-9956-ffa450edef68