build: add missing geocode-glib-1.0 dependency
The build fails for me on NixOS with:
clock-location-entry.c:25:10: fatal error: geocode-glib/geocode-glib.h: No such file or directory
25 | #include <geocode-glib/geocode-glib.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
And this patch resolves the build failure for me