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.

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