[PATCH] Add IPv6 support to GeoIP module

[csg]

Most IPv6 stuff was introduced with newer versions of the GeoIP library
(IIRC something around 1.4.7), so you might either want to autodetect
GeoIP's capabilities or embed the relevant stuff into

#if LIBGEOIP_VERSION >= 1004007
...
#endif

directives. Otherwise you might break builds against older versions of
the library.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,216238,216265#msg-216265