Failure to compile world

[Alex Kuster]

A follow-up on this is libc not building because of missing 
SCTP_REMOTE_UDP_ENCAPS_PORT
apparently the Makefile doesn't include /sys/ into the includes of the libc.

My current version (/usr/include/netinet/sctp.h) lacks that definition, 
it should look in the headers of the source, not the current system 
headers ... so I just added that to the Makefile ( 
lib/libc/net/Makefile.inc ).

I'm leaving note if anyone else experiences the same problem.