Fix compiler warnings: make FSX headers end with newlines.
No functional change.

* subversion/libsvn_fs_x/cached_data.h,
  subversion/libsvn_fs_x/changes.h,
  subversion/libsvn_fs_x/noderevs.h,
  subversion/libsvn_fs_x/reps.h,
  subversion/libsvn_fs_x/transaction.h,
  subversion/libsvn_fs_x/util.h
  (): add \n to the last line


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1509953 13f79535-47bb-0310-9956-ffa450edef68