roll-tarballs.sh: Adapt to recent changes in nx-libs, keep legacy support for older 3.6.x and 3.5.x releases.

Attributes GH PR #299: https://github.com/ArcticaProject/nx-libs/pull/299

Attributes GH PR #300: https://github.com/ArcticaProject/nx-libs/pull/300

Attributes GH PR #298: https://github.com/ArcticaProject/nx-libs/pull/298

debian/control: B-D alternatively on libxfont1-dev or libxfont-dev. Fix FTBFS on Debian stretch which has libxfont2-dev as default now.

 Fixes ArcticaProject/nx-libs#295.

Attributes GH PR #270: https://github.com/ArcticaProject/nx-libs/pull/270

 Derived from X.org commit...

 commit 28b95fd9d1c2f078aaaac75c310a27b17c74a6fc
 Author: Kristian Høgsberg <krh@redhat.com>
 Date:   Thu Jul 6 03:25:38 2006 -0400

    Drop unused GL/include subtree.

    Woo, less Makefile's to generate.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 commit 2d2d38d17cc2558f8a41166a4a1578bc4c663c37
 Author: Kristian Høgsberg <krh@redhat.com>
 Date:   Fri Mar 17 01:47:25 2006 +0000

        Check for glproto when building GLX and make sure we have at least 1.4.6.
        Drop glx_ansic.h wrapper and call xalloc, xrealloc, xfree and str-funcs
            directly.

     We don't check the glproto version as we know what it is (we have our own proto file).

     Furthermore, we skip the switch from --glX<func> -> x<func> and directly switch to
     <func> (e.g. __glXMalloc() -> malloc()).
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Attributes GH PR #251: https://github.com/ArcticaProject/nx-libs/pull/251

 From c3d14036729fd186d4ec7ca1de603e1f2d174e2f Mon Sep 17 00:00:00 2001
 From: Eric Anholt <anholt@freebsd.org>
 Date: Fri, 10 Feb 2006 22:00:30 +0000
 Subject: Remove libcwrapper usage from xorg server modules. The libcwrapper is
   only of (marginal) use in the drivers, and that usage remains.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 Fixes ArcticaProject/nx-libs#246 (together with merge commit
 ecd335fa).

Attributes GH PR #294: https://github.com/ArcticaProject/nx-libs/pull/294

 Fixes ArcticaProject/nx-libs#188.

Attributes GH PR #280: https://github.com/ArcticaProject/nx-libs/pull/280

Attributes GH PR #279: https://github.com/ArcticaProject/nx-libs/pull/279
Fixes ArcticaProject/nx-libs#264.

Attributes GH PR #283: https://github.com/ArcticaProject/nx-libs/pull/283

New helper script: regenerate-symbol-docs.sh. Plus update symbols usage of libNX_X11 and nxcompext in nxagent, nxcompext and libNX_X11.

Attributes GH PR: https://github.com/ArcticaProject/nx-libs/pull/277

Reviewed by: Ulrich Sibiller <uli42@gmx.de>  -- Tue, 15 Nov 2016 00:54:44 -0800

 Fixes ArcticaProject/nx-libs#276.

Attributes GH PR #243: https://github.com/ArcticaProject/nx-libs/pull/243

Remove check for the remote side operating system because the evdev
check will only succeed on Linux (and in future FreeBSD?) anyway.
Besides, this makes keycode conversion work when using nxagent without
nx transport (as an xnest replacement) or when not providing
client=linux in the options.

This fixes the second issue mentioned in ArcticaProject/nx-libs#239
(keyboard not working correctly).

Certain versions of LynxOS needed to sleep up to five seconds for closing a pipe to actually, y'know, be useful.
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>