Backport several changes from M&K

src/include/86box/device.h

@@ -90,7 +90,7 @@ typedef struct {
     const char *default_string;
     int default_int;
     const char *file_filter;
-    device_config_spinner_t spinner;
+    const device_config_spinner_t spinner;
     const device_config_selection_t selection[16];
 } device_config_t;