iuh: Coverity build breakage because of old sctp

Hi, sua.c: In function 'rx_inact_tmr_cb': sua.c:288: warning: unused variable 'conn' sua.c: In function 'sua_rx_coref': sua.c:908: warning: unused variable 'cause' sua.c: In function 'sua_rx_codt': sua.c:1059: warning: unused variable 'cur' sua.c: In function 'sua_srv_conn_cb': sua.c:1266: error: 'SCTP_SENDER_DRY_EVENT' undeclared (first use in this function) sua.c:1266: error: (Each undeclared identifier is reported only once sua.c:1266: error: for each function it appears in.) sua.c: In function 'sua_cli_read_cb': sua.c:1451: error: 'SCTP_SENDER_DRY_EVENT' undeclared (first use in this function) can we make the SCTP_SENDER_DRY_EVENT optional or is a strict requirement? If it is strict then maybe we can check for this in autoconf? holger