* subversion/include/private/svn_mutex.h   (svn_mutex__t): ensure we cannot access its content when threads are not supported
* subversion/include/private/svn_mutex.h
  (svn_mutex__t): ensure we cannot access its content when threads are not supported

Suggested by: danielsh

git-svn-id: 381aa894c3e6af1db0f31a0b5460797f4bbc1b6a@1142810 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion