Redefine the svn_hash_sets macro to match the way svn_hash_gets is defined, thus avoiding a backward compatibility problem. A follow-up to r1663760 and r1663780. Found by: danielsh * subversion/include/svn_hash.h (svn_hash__sets): New function. (svn_hash_sets): In debug mode, call svn_hash__sets; in release mode, call apr_hash_set directly. * subversion/libsvn_subr/hash.c (svn_hash__sets): New function.