Correct list of XNAP ASN.1 files generated by asn1c

Notably, remove asn_codecs_prim_xer.h from the list of files, triggering
problems when re-running ninja, because the "canonical OAI asn1c"
(https://github.com/mouse07410/asn1c, commit ID
940dd5fa9f3917913fd487b13dfddfacd0ded06e) does not generate it:

    ninja explain: output openair2/XNAP/MESSAGES/asn_codecs_prim_xer.h doesn't exist

In this version, a couple of files are not generated, so remove them
from the list.

Also, leave the files in the order as shown by ls.

openair2/XNAP/MESSAGES/ASN1/xnap_R16.2.0.cmake

 set(XNAP_GRAMMAR ASN1/xnap_R16.2.0.asn)
 
 set(xnap_source
+    ANY_aper.c
     ANY.c
+    ANY_uper.c
+    ANY_xer.c
     aper_decoder.c
     aper_encoder.c
     aper_opentype.c
@@ -22,68 +25,78 @@ set(xnap_source
     BIT_STRING_uper.c
     BIT_STRING_xer.c
     constraints.c
-    constr_CHOICE.c
     constr_CHOICE_aper.c
-    constr_CHOICE_rfill.c
+    constr_CHOICE.c
     constr_CHOICE_print.c
+    constr_CHOICE_rfill.c
     constr_CHOICE_uper.c
     constr_CHOICE_xer.c
-    constr_SEQUENCE.c
     constr_SEQUENCE_aper.c
-    constr_SEQUENCE_OF.c
+    constr_SEQUENCE.c
     constr_SEQUENCE_OF_aper.c
+    constr_SEQUENCE_OF.c
     constr_SEQUENCE_OF_uper.c
     constr_SEQUENCE_OF_xer.c
     constr_SEQUENCE_print.c
     constr_SEQUENCE_rfill.c
     constr_SEQUENCE_uper.c
     constr_SEQUENCE_xer.c
-    constr_SET_OF.c
     constr_SET_OF_aper.c
+    constr_SET_OF.c
     constr_SET_OF_print.c
     constr_SET_OF_rfill.c
     constr_SET_OF_uper.c
     constr_SET_OF_xer.c
     constr_TYPE.c
-    INTEGER.c
+    ENUMERATED_aper.c
+    ENUMERATED.c
+    ENUMERATED_uper.c
+    GraphicString.c
     INTEGER_aper.c
+    INTEGER.c
     INTEGER_print.c
     INTEGER_rfill.c
     INTEGER_uper.c
-    INTEGER_xer.c 
-    Makefile.am.libasncodec
-    NativeEnumerated.c
+    INTEGER_xer.c
     NativeEnumerated_aper.c
+    NativeEnumerated.c
     NativeEnumerated_uper.c
     NativeEnumerated_xer.c
-    NativeInteger.c
     NativeInteger_aper.c
-    NativeInteger_print.c 
+    NativeInteger.c
+    NativeInteger_print.c
     NativeInteger_rfill.c
     NativeInteger_uper.c
     NativeInteger_xer.c
-    NULL.c
     NULL_aper.c
+    NULL.c
     NULL_print.c
     NULL_rfill.c
     NULL_uper.c
     NULL_xer.c
+    ObjectDescriptor.c
     OBJECT_IDENTIFIER.c
     OBJECT_IDENTIFIER_print.c
     OBJECT_IDENTIFIER_rfill.c
     OBJECT_IDENTIFIER_xer.c
+    OCTET_STRING_aper.c
     OCTET_STRING.c
-    OCTET_STRING_aper.c 
     OCTET_STRING_print.c
     OCTET_STRING_rfill.c
     OCTET_STRING_uper.c
     OCTET_STRING_xer.c
-    OPEN_TYPE.c
     OPEN_TYPE_aper.c
+    OPEN_TYPE.c
     OPEN_TYPE_uper.c
     OPEN_TYPE_xer.c
-    per_opentype.c
+    per_decoder.c
     per_encoder.c
+    per_opentype.c
+    per_support.c
+    uper_decoder.c
+    uper_encoder.c
+    uper_opentype.c
+    uper_support.c
     VisibleString.c
     xer_decoder.c
     xer_encoder.c
@@ -283,6 +296,7 @@ set(xnap_source
     XNAP_ExtendedPacketDelayBudget.c
     XNAP_ExtendedRATRestrictionInformation.c
     XNAP_ExtendedSliceSupportList.c
+    XNAP_EXTERNAL.c
     XNAP_ExtTLA-Item.c
     XNAP_ExtTLAs.c
     XNAP_FailureIndication.c
@@ -873,9 +887,6 @@ set(xnap_source
     XNAP_XnUAddressIndication.c
     XNAP_XnUAddressInfoperPDUSession-Item.c
     XNAP_XnUAddressInfoperPDUSession-List.c
-    uper_encoder.c
-    uper_opentype.c
-    uper_support.c
 )
 
 set(xnap_headers
@@ -888,7 +899,7 @@ set(xnap_headers
     asn_bit_data.h
     asn_codecs.h
     asn_codecs_prim.h
-    asn_codecs_prim_xer.h
+    asn_config.h
     asn_internal.h
     asn_ioc.h
     asn_random_fill.h
@@ -898,72 +909,30 @@ set(xnap_headers
     ber_tlv_length.h
     ber_tlv_tag.h
     BIT_STRING.h
-    BIT_STRING_print.h
-    BIT_STRING_rfill.h
-    BIT_STRING_uper.h
-    BIT_STRING_xer.h
     constraints.h
     constr_CHOICE.h
-    constr_CHOICE_aper.h
-    constr_CHOICE_print.h
-    constr_CHOICE_rfill.h
-    constr_CHOICE_uper.h
-    constr_CHOICE_xer.h
     constr_SEQUENCE.h
-    constr_SEQUENCE_aper.h
     constr_SEQUENCE_OF.h
-    constr_SEQUENCE_OF_aper.h
-    constr_SEQUENCE_OF_uper.h
-    constr_SEQUENCE_OF_xer.h
-    constr_SEQUENCE_print.h
-    constr_SEQUENCE_rfill.h
-    constr_SEQUENCE_uper.h
-    constr_SEQUENCE_xer.h
     constr_SET_OF.h
-    constr_SET_OF_aper.h
-    constr_SET_OF_print.h
-    constr_SET_OF_rfill.h
-    constr_SET_OF_uper.h
-    constr_SET_OF_xer.h
     constr_TYPE.h
+    ENUMERATED.h
+    GraphicString.h
     INTEGER.h
-    INTEGER_aper.h
-    INTEGER_print.h
-    INTEGER_rfill.h
-    INTEGER_uper.h
-    INTEGER_xer.h 
     NativeEnumerated.h
-    NativeEnumerated_aper.h
-    NativeEnumerated_uper.h
-    NativeEnumerated_xer.h
     NativeInteger.h
-    NativeInteger_aper.h
-    NativeInteger_print.h 
-    NativeInteger_rfill.h
-    NativeInteger_xer.h
-    NativeInteger_uper.h
     NULL.h
-    NULL_aper.h
-    NULL_print.h
-    NULL_rfill.h 
-    NULL_uper.h
-    NULL_xer.h
+    ObjectDescriptor.h
     OBJECT_IDENTIFIER.h
-    OBJECT_IDENTIFIER_print.h
-    OBJECT_IDENTIFIER_rfill.h
-    OBJECT_IDENTIFIER_xer.h
     OCTET_STRING.h
-    OCTET_STRING_aper.h 
-    OCTET_STRING_print.h
-    OCTET_STRING_rfill.h
-    OCTET_STRING_uper.h
-    OCTET_STRING_xer.h
     OPEN_TYPE.h
-    OPEN_TYPE_aper.h
-    OPEN_TYPE_uper.h
-    OPEN_TYPE_xer.h
+    per_decoder.h
     per_encoder.h
     per_opentype.h
+    per_support.h
+    uper_decoder.h
+    uper_encoder.h
+    uper_opentype.h
+    uper_support.h
     VisibleString.h
     xer_decoder.h
     xer_encoder.h
@@ -1164,6 +1133,7 @@ set(xnap_headers
     XNAP_ExtendedPacketDelayBudget.h
     XNAP_ExtendedRATRestrictionInformation.h
     XNAP_ExtendedSliceSupportList.h
+    XNAP_EXTERNAL.h
     XNAP_ExtTLA-Item.h
     XNAP_ExtTLAs.h
     XNAP_FailureIndication.h
@@ -1754,8 +1724,4 @@ set(xnap_headers
     XNAP_XnUAddressIndication.h
     XNAP_XnUAddressInfoperPDUSession-Item.h
     XNAP_XnUAddressInfoperPDUSession-List.h
-    uper_encoder.h
-    uper_opentype.h
-    uper_support.h
 )
-