Cleaner way to conditionally disallow a CONFIG option as static

[Sridhar Samudrala]

SCTP is allowed to be static only when IPV6 is also configured as static or
not enabled. If IPV6 is configured as a module, SCTP also has to be a module.
This is done right now in the following hackish ways in 2.6 and 2.4 using an
additional config option(CONFIG_IPV6_SCTP__).

In 2.6, net/sctp/Kconfig

config IPV6_SCTP__
	tristate
	default y if IPV6=n
	default IPV6 if IPV6

config IP_SCTP
	tristate "The SCTP Protocol (EXPERIMENTAL)"
	depends on IPV6_SCTP__
--------------------------------------------------------
In 2.4, net/sctp/Config.in

if [ "$CONFIG_IPV6" != "n" ]; then
   define_bool CONFIG_IPV6_SCTP__ $CONFIG_IPV6
else
   define_bool CONFIG_IPV6_SCTP__ y
fi

dep_tristate '  The SCTP Protocol (EXPERIMENTAL)' CONFIG_IP_SCTP $CONFIG_IPV6_SCTP__
--------------------------------------------------------

Is there a much simpler and cleaner way to accomplish this in 2.6 and 2.4
config files?

Thanks
Sridhar
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