ifa_flags is uint_64 on Solaris/illumos

[mtelka]

The ifa_flags is declared as c_ulong here for solarish, but actually in both Solaris and illumos it is uint_64:

• https://illumos.org/man/3SOCKET/getifaddrs
• https://docs.oracle.com/cd/E88353_01/html/E37843/getifaddrs-3c.html

I think the type of ifa_flags should be changed to u64 here.

This issue was found during the illumos support fix work for GStreamer.

[devnexen]

If you feel like it, you can create a PR targeting libc-0.2 for starter.

[mtelka]

Why not main first?

[devnexen]

sure, but regardless your fix will need to be backported to libc-0.2 if we want to land for the next release (main relates to future 0.3).