just as the rest of the Xserver is alsow doing

nxagentWindowTopLevel() and nxagentNeedConnectionChange() return Boolean
nxagentPixmapIsVirtual() and nxagentIsShmPixmap(), too.

They have been changed to tri-state variables (1, 0 and UNDEFINED)
between nxagent 1.5.0-90 and -93, for no obvious reason.

Many variables are used as Booleans. By adding the Bool define to
Options.h we can now make that visible.

and add the missing init code.

Adaptive, Composite, DeviceControl, DeviceControlUserDefined,
IgnoreVisibility, InhibitXkb, Nested, Menu, MagicPixel, Persistent,
Reset, ResetzKeyboardAtResume, SharedMemory, SharedPixmaps, Streaming,
UseDamage, ViewOnly, Xdmcp, Xinerama

The already where Booleans but where not using True/False values everywhere

There's no need/sense in having a tri-state with the third state being
UNDEFINED.

Fixes ArcticaProject/nx-libs#903

  Backported from X.org:

  From 446ff2d3177087b8173fa779fa5b77a2a128988b Mon Sep 17 00:00:00 2001
  From: Matthieu Herrb <matthieu@herrb.eu>
  Date: Thu, 12 Nov 2020 19:15:07 +0100
  Subject: [PATCH] Check SetMap request length carefully.

  Avoid out of bounds memory accesses on too short request.

  ZDI-CAN 11572 /  CVE-2020-14360

  This vulnerability was discovered by:
  Jan-Niklas Sohn working with Trend Micro Zero Day Initiative

  Fixes ArcticaProject/nx-libs#972.

Fixes ArcticaProject/nx-libs#983

causing DEBUG output in regular builds.