Add missing header files to macos.c

Missing header files were causing errors opening cloud storage on
launch on Mac OSX.

Signed-off-by: Doug Junkins <junkins@foghead.com>

CHANGELOG.md

@@ -1,3 +1,4 @@
+- Desktop: fix missing header files in macos.c
 - Desktop: fix display of trip time
 ---
 * Always add new entries at the very top of this file above other existing entries and this note.

core/macos.c

@@ -17,6 +17,8 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <zip.h>
+#include <sys/stat.h>
 
 void subsurface_user_info(struct user_info *info)
 {