Make gcc happy by decaring a function with an explicit void argument.

* subversion/include/private/svn_sqlite.h
  (svn_sqlite__dbg_enable_errorlog): Update prototype.

* subversion/libsvn_subr/sqlite.c
  (svn_sqlite__dbg_enable_errorlog): Update prototype.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1558473 13f79535-47bb-0310-9956-ffa450edef68