preserve order of attribute values, from git upstream 3ae1458bb7

--- diff.c.orig	Sat May  5 11:17:26 2007
+++ diff.c	Thu Mar  1 22:19:30 2012
@@ -46,22 +46,32 @@ compare_ptr_arrays(GPtrArray *a, GPtrArray *b,
 		for (; i < a->len; i++) note(g_ptr_array_index(a, i), 0, x);
 }
 
-static void
-note_values(GArray *a, GArray *b, int *changed)
+static int
+ordered_array_equal(GPtrArray *a, GPtrArray *b,
+		  int (*cmp)(const void *, const void *))
 {
-	if (!(a && b)) *changed = 1;
+	int i;
+
+	if (a->len != b->len)
+		return 0;
+
+	for (i = 0; i < a->len; i++) {
+		void *ax = g_ptr_array_index(a, i);
+		void *bx = g_ptr_array_index(b, i);
+		if (cmp(&ax, &bx))
+			return 0;
+	}
+
+	return 1;
 }
 
 static void
 compare_attributes(tattribute *clean, tattribute *new, GPtrArray *mods)
 {
-	int changed = 0;
-	compare_ptr_arrays(attribute_values(clean),
-			   attribute_values(new),
-			   carray_ptr_cmp,
-			   (note_function) note_values,
-			   &changed);
-	if (changed) {
+	if (!ordered_array_equal(attribute_values(clean),
+				 attribute_values(new),
+				 carray_ptr_cmp))
+	{
 		LDAPMod *m = attribute2mods(new);
 		m->mod_op |= LDAP_MOD_REPLACE;
 		g_ptr_array_add(mods, m);