remove SYSFLAGS and MFLOPPY code

A check into github issue 364 confirmed that
ba6edbe5dc
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The SYSFLAGS and MFLOPPY code is all in the outdated part of the tree, so just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

src/decl.c

@@ -1,4 +1,4 @@
-/* NetHack 3.6	decl.c	$NHDT-Date: 1591017417 2020/06/01 13:16:57 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.213 $ */
+/* NetHack 3.6	decl.c	$NHDT-Date: 1593953345 2020/07/05 12:49:05 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.214 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Michael Allison, 2009. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -22,9 +22,6 @@ const schar zdir[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, -1 };
 
 NEARDATA struct flag flags;
 NEARDATA boolean has_strong_rngseed = FALSE;
-#ifdef SYSFLAGS
-NEARDATA struct sysflag sysflags;
-#endif
 NEARDATA struct instance_flags iflags;
 NEARDATA struct you u;
 NEARDATA time_t ubirthday;
@@ -349,13 +346,6 @@ const struct instance_globals g_init = {
 #ifdef MICRO
     UNDEFINED_VALUES, /* levels */
 #endif /* MICRO */
-#ifdef MFLOPPY
-    UNDEFINED_VALUES, /* permbones */
-    FALSE,     /*ramdisk */
-    TRUE, /* saveprompt */
-    "levels.*", /* alllevels */
-    "bones*.*", /* allbones */
-#endif
     UNDEFINED_VALUES, /* program_state */
 
     /* detect.c */
@@ -744,9 +734,6 @@ decl_globals_init()
     g.subrooms = &g.rooms[MAXNROFROOMS + 1];
 
     ZERO(flags);
-#ifdef SYSFLAGS
-    ZERO(sysflags);
-#endif
     ZERO(iflags);
     ZERO(u);
     ZERO(ubirthday);