Fix a crash bug in svndiff-test (which is generally unused).
Fix a crash bug in svndiff-test (which is generally unused).

* tests/libsvn_delta/svndiff-test.c (main): Initialize APR before
  making any APR calls.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@849155 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion