[SCTP]: Don't export include/linux/sctp.h to userspace.

This file contains protocol definitions and there are no SCTP apps
that use this file.

Signed-off-by: Sridhar Samudrala <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/Kbuild

···
 header-y += raw.h
 header-y += resource.h
 header-y += rose.h
-header-y += sctp.h
 header-y += smbno.h
 header-y += snmp.h
 header-y += sockios.h