Check for the IPPROTO_IPV6 define before using it

This fixes building on FreeBSD in some configurations, if the IPv6 multicast
structs are available, but IPPROTO_IPV6 isn't defined.

Originally committed as revision 25147 to svn://svn.ffmpeg.org/ffmpeg/trunk
oldabi
Martin Storsjö 14 years ago
parent f41237c9db
commit 63206a8ffb
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