Add new error code for runtime compatibility tests.

* subversion/include/svn_error_codes.h
  (SVN_ERR_UNSUPPORTED_DEPENDENCY): New.

* subversion/libsvn_subr/sqlite.c
  (svn_sqlite__open): Use the new code.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1566978 13f79535-47bb-0310-9956-ffa450edef68