Remove an unneeded interlibrary header, to avoid unneeded discussion over it.
No functional changes.

* subversion/libsvn_client/mtcc.c
  (includes): Remove mtcc.h.
  (svn_client_mtcc_kind_t,
   svn_client_mtcc_op_t,
   MTCC_UNMODIFIED,
   svn_client_mtcc_t): Move here from mtcc.h

* subversion/libsvn_client/mtcc.h
  Delete unused file.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1562068 13f79535-47bb-0310-9956-ffa450edef68