[PATCH] Have netstat test for sctp kernel support

[Sean Mahood]

Hello,

I noticed that when doing a netstat -s (running on a kernel without  
SCTP support compiled in), I get the following message output to stderr:

netstat: sysctl: net.inet.sctp.stats: No such file or directory

Wondering why it would attempt to fetch SCTP stats when it was  
compiled out of the kernel, I noted that netstat could be compiled  
without SCTP support as well, but that there is no good way to link  
the two compilation conditions, or to have a generic binary that can  
run without error regardless of compiled kernel options.

To that end, I added a method to check for environment compatibility  
in netstat. For SCTP specifically, I used the FEATURE macros and added  
SCTP as a FEATURE.

Other protocols could also be configured to be checked at runtime if  
desired, though I haven't implemented any others at this time.

-- Sean



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