remove SYSFLAGS and MFLOPPY code

A check into github issue 364 confirmed that
https://github.com/NetHack/NetHack/commit/ba6edbe5dcfbd27c03683e4d7aebf9593b24c5a7
had incorrectly updated the bwrite sizeof entry for sysflags.

The SYSFLAGS and MFLOPPY code is all in the outdated part of the tree, so just
remove it rather than re-correct it.

Closes #364
Closes #207

include/dungeon.h

@@ -1,4 +1,4 @@
-/* NetHack 3.6	dungeon.h	$NHDT-Date: 1447755969 2015/11/17 10:26:09 $  $NHDT-Branch: master $:$NHDT-Revision: 1.24 $ */
+/* NetHack 3.6	dungeon.h	$NHDT-Date: 1593953333 2020/07/05 12:48:53 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.38 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Michael Allison, 2006. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -167,15 +167,6 @@ struct linfo {
         /* Note:  VISITED and LFILE_EXISTS are currently almost always
          * set at the same time.  However they _mean_ different things.
          */
-#ifdef MFLOPPY
-#define FROMPERM 1 /* for ramdisk use */
-#define TOPERM 2   /* for ramdisk use */
-#define ACTIVE 1
-#define SWAPPED 2
-    int where;
-    long time;
-    long size;
-#endif /* MFLOPPY */
 };
 
 /* types and structures for dungeon map recording