Unbreak the build, after r1471638.

* subversion/tests/libsvn_fs_fs/fs-pack-test.c
  (test_info): Make it conditional on -DSVN_FS_INFO.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1471642 13f79535-47bb-0310-9956-ffa450edef68