conditional compile for apache 2.2 and 2.4 / client_ip vs. remote_ip

@@ -98,9 +98,11 @@ entropy_filter_in(
 	/**
 	 * add client ip to sha1
 	 */
-	remote_ip = (ap_version.minor < 4)?
-		connection->remote_ip:
-		connection->client_ip;
+#if 4 > HTTP_VERSION_MINOR(number)
+	remote_ip = connection->remote_ip;
+#else
+	remote_ip = connection->client_ip;
+#endif
 
 	apr_sha1_update(&sha1_ctx, remote_ip, strlen(remote_ip));