revert back the lvalue casting; fix is even less compatible

diff --git a/skeletons/constr_SET_OF.c b/skeletons/constr_SET_OF.c
index febabe1..fa93240 100644
--- a/skeletons/constr_SET_OF.c
+++ b/skeletons/constr_SET_OF.c
@@ -214,7 +214,7 @@
 		case RC_OK:
 			{
 				A_SET_OF(void) *list;
-				list = (A_SET_OF(void) *)st;
+				(void *)list = (void *)st;
 				if(ASN_SET_ADD(list, ctx->ptr) != 0)
 					RETURN(RC_FAIL);
 				else
@@ -329,7 +329,7 @@
 	/*
 	 * Gather the length of the underlying members sequence.
 	 */
-	list = (A_SET_OF(void) *)ptr;
+	(void *)list = ptr;
 	for(edx = 0; edx < list->count; edx++) {
 		void *memb_ptr = list->array[edx];
 		erval = der_encoder(elm_type, memb_ptr, 0, elm->tag, 0, 0);
@@ -507,7 +507,7 @@
 
 	if(!sptr) _ASN_ENCODE_FAILED;
 
-	list = (A_SET_OF(void) *)sptr;
+	(void *)list = sptr;
 
 	if(xcan) {
 		encs = (xer_tmp_enc_t *)MALLOC(list->count * sizeof(encs[0]));
@@ -601,7 +601,7 @@
 	|| cb(" ::= {", 6, app_key) < 0)
 		return -1;
 
-	list = (const A_SET_OF(void) *)sptr;
+	(const void *)list = sptr;
 	for(i = 0; i < list->count; i++) {
 		const void *memb_ptr = list->array[i];
 		if(!memb_ptr) continue;
@@ -630,7 +630,7 @@
 		 * Could not use set_of_empty() because of (*free)
 		 * incompatibility.
 		 */
-		list = (A_SET_OF(void) *)ptr;
+		(void *)list = ptr;
 		for(i = 0; i < list->count; i++) {
 			void *memb_ptr = list->array[i];
 			if(memb_ptr)
@@ -661,7 +661,7 @@
 		return -1;
 	}
 
-	list = (const A_SET_OF(void) *)sptr;
+	(const void *)list = sptr;
 
 	constr = element->memb_constraints;
 	if(!constr) constr = element->type->check_constraints;