back out last change: there is a better way

lib/backupfile.c

@@ -105,10 +105,6 @@ char *malloc ();
 # define EXIT_FAILURE 1
 #endif
 
-#ifndef BACKUPFILE_EXIT_FAILURE
-# define BACKUPFILE_EXIT_FAILURE EXIT_FAILURE
-#endif
-
 /* The extension added to file names to produce a simple (as opposed
    to numbered) backup file name. */
 const char *simple_backup_suffix = "~";
@@ -248,7 +244,7 @@ get_version (const char *version)
   if (i < 0)
     {
       invalid_arg ("version control type", version, i);
-      exit (BACKUPFILE_EXIT_FAILURE);
+      exit (EXIT_FAILURE);
     }
   return backup_types[i];
 }