Populate GEO:COUNTRY_NAME and GEO:COUNTRY_CONTINENT as documented (MODSEC-45).

Handle a newer geo database, avoiding a potential crash.
Allow checking &GEO "@eq 0" for a failed @geoLookup.

apache2/msc_geo.h

@@ -29,6 +29,8 @@
 #define GEO_COUNTRY_DATABASE      1
 #define GEO_CITY_DATABASE_0       6
 #define GEO_CITY_DATABASE_1       2
+#define GEO_COUNTRY_LAST          250
+
 
 typedef struct geo_rec geo_rec;
 typedef struct geo_db geo_db;