* subversion/include/svn_error_codes.h (SVN_ERR_RECURSIVE_LOCK): Remove as it has no users anymore. (SVN_ERR_INVALID_INPUT): Update number.
* subversion/libsvn_subr/mutex.c (svn_mutex__t): Remove all aux. members that were used for mutex checking only. Make sure we don't end up with an empty struct on systems that don't support threads. (svn_mutex__init, svn_mutex__lock, svn_mutex__unlock): Remove all mutex the checking code.
* subversion/tests/libsvn_fs_fs/fs-fs-pack-test.c (never_reached, lock_again, recursive_locking): Remove test case for "checked" mutexes. (test_funcs): Remove test from list.