add interface macro

refpolicy/policy/support/loadable_module.spt

@@ -26,6 +26,19 @@ define(`requires_block_template',`
 	')
 ')
 
+##############################
+#
+# In the future interfaces could be in loadable modules
+#
+# module_interface(name,rules)
+#
+define(`module_interface',`
+	define(`$1',`
+		requires_block_template(`$1'_depend)
+		$2
+	')
+')
+
 ##############################
 #
 # Optional policy handling