Silence warnings by adding missing includes

src/calcelestial.c

@@ -46,6 +46,7 @@
 #include "objects.h"
 #include "helpers.h"
 #include "formatter.h"
+#include "geonames.h"
 
 enum moment {
 	MOMENT_NOW,

src/helpers.c

@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <time.h>
+#include <math.h>
 
 #include <libnova/libnova.h>