Geoip cache options patch

[Akins, Brian]

The attached patch allows you to change the geoip cache option in the
config.  For example:

geoip_country /usr/share/GeoIP/GeoIP.dat mmap;

Will use GEOIP_MMAP_CACHE.  The default is memory ( GEOIP_MEMORY_CACHE ),
the same as today.  The mmap option can make a large difference in memory
usage when using the large city data files.


-- 
Brian Akins

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