Update to latest prototype

This commit was SVN r7970.

orte/mca/gpr/null/gpr_null.c

@@ -103,7 +103,7 @@ orte_gpr_null_get(orte_gpr_addr_mode_t addr_mode,
 static int
 orte_gpr_null_get_conditional(orte_gpr_addr_mode_t addr_mode,
              char *segment, char **tokens, char **keys,
-             orte_gpr_keyval_t **conditions,
+             size_t num_conditions, orte_gpr_keyval_t **conditions,
              size_t * cnt, orte_gpr_value_t *** values)
 {
   return ORTE_ERR_NOT_IMPLEMENTED;