pgoyette 2dd28fa0fe 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		2017-12-09 08:03:06 +00:00
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