port/merge Eurecom APER support from OPENAIRMME

Eurecom has developed APER support for asn1c as part of the OPENAIRMME
softare (a LTE MME).  This is too important to let it bit-rout out
of asn1c.  Let's forward-port and merge it.
diff --git a/skeletons/T61String.c b/skeletons/T61String.c
index 115d7d4..4a6ad47 100644
--- a/skeletons/T61String.c
+++ b/skeletons/T61String.c
@@ -24,6 +24,8 @@
 	OCTET_STRING_encode_xer,
 	OCTET_STRING_decode_uper,
 	OCTET_STRING_encode_uper,
+	OCTET_STRING_decode_aper,
+	OCTET_STRING_encode_aper,
 	0, /* Use generic outmost tag fetcher */
 	asn_DEF_T61String_tags,
 	sizeof(asn_DEF_T61String_tags)