Split ip_ecn code into its own module, so it can be shared between
gif(4), stf(4), and ipsec(4). Without this, loading the if_gif
module can result in redefined global symbols if either ipsec(4) or

Split ip_ecn code into its own module, so it can be shared between
gif(4), stf(4), and ipsec(4). Without this, loading the if_gif
module can result in redefined global symbols if either ipsec(4) or
stf(4) but not gif(4) is built into the kernel.

Fixes PR kern/52795 (as reported by martin@ via irc).

XXX pullup to netbsd-8

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