follow-up on the util/recover.c change earlier

It failed in the CI

util/recover.c

@@ -22,6 +22,10 @@ extern int vms_creat(const char *, unsigned);
 extern int vms_open(const char *, int, unsigned);
 #endif /* VMS */
 
+#ifndef nhUse
+#define nhUse(arg) (void)(arg)
+#endif
+
 int restore_savefile(char *);
 void set_levelfile_name(int);
 int open_levelfile(int);