[meson] add missing libmaxminddb section
[meson] add missing libmaxminddb section

Fixes the following error when building with -Dwith_maxminddb=true:

meson.build:916:1: ERROR: Unknown variable "libmaxminddb".

A full log can be found at meson-logs/meson-log.txt

Signed-off-by: Rosen Penev <cd9d359349c2d33dfd3bf458517d943871c7c054@gmail.com>

lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4