build: Remove direct dependency on geocode-glib

It's still a dependency through libgweather, but Calendar doesn't use it
directly. It looks like it was added for the weather feature, in a
function that ended up being removed.

src/meson.build

@@ -13,7 +13,6 @@ gcal_deps = [
   gio_dep,
   gweather_dep,
   geoclue_dep,
-  geocode_dep,
   m_dep,
 ]
 

src/weather/gcal-weather-service.c

@@ -18,7 +18,6 @@
 
 #define G_LOG_DOMAIN      "GcalWeatherService"
 
-#include <geocode-glib/geocode-glib.h>
 #include <geoclue.h>
 #include <string.h>
 #include <math.h>