Add diameter to APPLICATIONS DISABLED, if SCTP is missing when building Erlang/OTP

[ebengt]

Is your feature request related to a problem? Please describe.

Erlang diameter application fail with {error,eprotonosupport} on many Linux distributions.
This is due to missing SCTP.
It has to be added to the base.

Describe the solution you'd like

If SCTP is missing when building Erlang/OTP I would like diameter to get the same kind of APPLICATIONS DISABLED that I get for jinterface and odbc.

Describe alternatives you've considered

Since a Diameter client is allowed to not support SCTP, it could be that only the Erlang diameter server is disabled, but I think that is too complex and rarely needed.

[bmk]

The use of SCTP as a transport is optional, so building diameter should not fail just because SCTP is missing.
Maybe we could add a warning, indicating that diameter server will not function properly (without SCTP).

[ebengt]

SCTP is requiered by Diameter standard. For server.
But of course you may add a warning.