src: replace old IP*T_ALIGN macros

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/libiptc/libip6tc.c b/libiptc/libip6tc.c
index c1508cd..0f8a889 100644
--- a/libiptc/libip6tc.c
+++ b/libiptc/libip6tc.c
@@ -107,7 +107,7 @@
 #define LABEL_DROP		IP6TC_LABEL_DROP
 #define LABEL_QUEUE		IP6TC_LABEL_QUEUE
 
-#define ALIGN			IP6T_ALIGN
+#define ALIGN			XT_ALIGN
 #define RETURN			IP6T_RETURN
 
 #include "libiptc.c"
@@ -241,7 +241,7 @@
 	mptr = matchmask + sizeof(STRUCT_ENTRY);
 	if (IP6T_MATCH_ITERATE(a, match_different, a->elems, b->elems, &mptr))
 		return NULL;
-	mptr += IP6T_ALIGN(sizeof(struct ip6t_entry_target));
+	mptr += XT_ALIGN(sizeof(struct ip6t_entry_target));
 
 	return mptr;
 }