BUG/MEDIUM: pattern: some entries are not deleted with case insensitive match

ACL or map entries are not deleted with the command "del acl" or "del map"
if the case insentive flag is set.

This is because the the case insensitive string are stored in a list and the
default delete function associated with string looks in a tree. I add a check
of the case insensitive flag and execute the delete function for lists if it
is set.

This patch must be backported in 1.5 version.
(cherry picked from commit 73bc285be194f443dc7eab9c949e87e1dbe8f70c)
diff --git a/src/pattern.c b/src/pattern.c
index a6fc52d..b19ffe2 100644
--- a/src/pattern.c
+++ b/src/pattern.c
@@ -1308,6 +1308,10 @@
 	struct ebmb_node *node, *next_node;
 	struct pattern_tree *elt;
 
+	/* If the flag PAT_F_IGNORE_CASE is set, we cannot use trees */
+	if (expr->mflags & PAT_MF_IGNORE_CASE)
+		return pat_del_list_ptr(expr, ref);
+
 	/* browse each node of the tree. */
 	for (node = ebmb_first(&expr->pattern_tree), next_node = node ? ebmb_next(node) : NULL;
 	     node;