Note:

  - The "normal" way to inject CFLAGS (and CPPFLAGS) into nx-X11 builds is copying those
    options over into the variable CDEBUGFLAGS.
  - LDFLAGS have to be handed to nx-X11 via LOCAL_LDFLAGS.

 This change also includes a slight change in the nx-X11 build order.

 Old build order:

  Main Makefile:

      - [...]
      - libNX_X11
        + implicitly building nxcomp
        + implicitly building nxcompext
      - [...]
      - nxagent
        + implicitly building nxcompshad
      - [...]

 New build ordner:

  Main Makefile:

      - [...]
      - nxcomp
      - setup nx-X11 build env
        + cd nx-X11 && make BuildEnv
      - nx-X11/lib/*
      - nxcompext
      - nxcompshad
      - [...]
      - nxagent
      - [...]

 Fixes ArcticaProject/nx-libs#141
 Fixes X2GoBTS#84

debian/libnx-x11-6.symbols: Update symbols (added: _XEatDataWords@Base 3.5.99.0, _XGetRequest@Base 3.5.99.0).

Attributes GH PR #146: https://github.com/ArcticaProject/nx-libs/pull/146
Reviewed by: Vadim Troshchinskiy <vadim@qindel.com>  -- Thu, 30 Jun 2016 06:30:46 -0700

Attributes GH PR #170: https://github.com/ArcticaProject/nx-libs/pull/170

This required for successful linking of libXrender against libNX_X11.

Port from libXfixes commit b031e3b60fa1af9e49449f23d4a84395868be3ab We
need this here to enable linking of current libXrender against
libNX_X11 instead of the system's libX11

The original implementation of this function (libX11 commit
9f5d83706543696fc944c1835a403938c06f2cc5) uses xcb stuff which we do
not have in libNX_X11. So we take a workaround from another lib. This
workaround had been added temporarily to a couple of X extension libs,
see
e.g. https://lists.x.org/archives/xorg-devel/2013-July/036763.html.

To enable linking of a current libXrender libNX_X11 needs that symbol.

This is a (manual) backport of the following upstream libX11 commit
available at
https://cgit.freedesktop.org/xorg/lib/libX11/commit/src/XlibInt.c?id=4a060f993bf676cf21ad9784e010f54134da7b40:

     Commit: 4a060f993bf676cf21ad9784e010f54134da7b40
     Author: Peter Hutterer <peter.hutterer@who-t.net>
     Date: Mon, 17 Oct 2011 09:45:15 +1000
     Subject: Add _XGetRequest as substitute for GetReq/GetReqExtra

Attributes GH PR #145: https://github.com/ArcticaProject/nx-libs/pull/145
Self-reviewed: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>  -- Wed, 29 Jun 2016 11:22:30 +0200

 The x2goagent package is being replaced by an x2goserver bin:package
 named x2goserver-x2goagent.

 This x2goserver-x2goagent bin:package will be maintained in the X2Go
 Project's namespace and basically wraps around nxagent.

 Furthermore, declare Arctica Project as upstream source for nx-libs.

Attributes GH PR #121: https://github.com/ArcticaProject/nx-libs/pull/121
Reviewed by: Vadim Troshchinskiy <vadim@qindel.com>  -- Wed, 29 Jun 2016 00:45:43 -0700

fix wrong bin:package for Xext proto headers: Move dpmsstr.h and securstr.h from Xext devel package into proto header package.

 We have to make sure that all X.org libraries we link against
 use symbols provided by libNX_X11.

Merge branch 'sunweaver-pr/hw-nxagent-drop-duplicate-Xserver-code_disable-Xserver-code-and-include-in-nxagent' into arctica-3.6.x

Attributes GH PR #120: https://github.com/ArcticaProject/nx-libs/pull/120

hw/nxagent/NX*.c: Amend re-introduced nxagent warnings by fixing the corresponding code section in files included from "somewhere" in nx-X11/programs/Xserver/.

 (1)
 In file included from NXrender.c:44:0:
 ../../mi/../render/render.c: In function ‘swapStops’:
 ../../mi/../render/render.c:2541:13: warning: variable ‘colors’ set but not used [-Wunused-but-set-variable]
      CARD16 *colors;
              ^

 (2)
 In file included from NXevents.c:133:0:
 ../../dix/events.c: In function ‘ReinitializeRootWindow’:
 ../../dix/events.c:2046:15: warning: unused variable ‘pScreen’ [-Wunused-variable]
      ScreenPtr pScreen = win->drawable.pScreen;
                ^
 ../../dix/events.c: In function ‘XineramaPointInWindowIsVisible’:
 ../../dix/events.c:2177:15: warning: variable ‘pScreen’ set but not used [-Wunused-but-set-variable]
      ScreenPtr pScreen = pWin->drawable.pScreen;
                ^
 In file included from NXevents.c:133:0:
 ../../dix/events.c: In function ‘XineramaPointInWindowIsVisible’:
 ../../dix/events.c:2191:2: error: ‘pScreen’ undeclared (first use in this function)
   pScreen = pWin->drawable.pScreen;
   ^

 (3)
 In file included from NXdixfonts.c:77:0:
 ../../dix/dixfonts.c: In function ‘GetFontPath’:
 ../../dix/dixfonts.c:1890:2: warning: return makes pointer from integer without a cast
   return BadAlloc;
   ^

hw/nxagent/NXdixfonts.c: Shrink file, drop duplicate code that can identically be found in dix/dixfonts.c. Also remove NX'ish code from dix/dixfonts.c.

hw/nxagent/NXdispatch.c: Shrink file, drop duplicate code that can identically be found in dix/dispatch.c.

hw/nxagent/NXproperty.c: Shrink file, drop duplicate code that can identically be found in dix/property.c.

hw/nxagent/NXxvdisp.c: Shrink file, drop duplicate code that can identically be found in Xext/xvdisp.c.

hw/nxagent/NXevents.c: Shrink file, drop duplicate code that can identically be found in dix/events.c.

hw/nxagent/NXglyph.c: Shrink file, drop duplicate code that can identically be found in render/glyph.c.

hw/nxagent/NXglyphcurs.c: Shrink file, drop duplicate code that can identically be found in dix/glyphcurs.c.

hw/nxagent/NXrender.c: Shrink file, drop duplicate code that can identically be found in render/render.c.

Fixes ArcticaProject/nx-libs#37

hw/nxagent/NX{glyphstr,picturestr}.h: Don't ship the complete header files in nxagent's code base. Rather replace structures we need modified only.

NXrenderint.h: Move into subfolder X11/include/ and rename to Xrender_nxagent.h. (Like we have done with all other non-public Xlib related header files that are required for building nxagent.

hw/nxagent/NXresource.c: Shrink file, drop duplicate code that can identically be found in dix/resource.c.

Xserver/dix/window.c: Don't reintroduce build warnings with previous commit due to now-unnecessary assignements of pScreen pointers.

hw/nxagent/NXwindow.c: Shrink file, drop duplicate code that can identically be found in dix/window.c.

hw/nxagent/NXglxext.c: Shrink file, drop duplicate code that can identically be found in GL/glx/glxext.c.

hw/nxagent/NXpicture.c: Shrink file, drop duplicate code that can identically be found in render/picture.c.

hw/nxagent/NXmiexpose.c: Shrink file, drop duplicate code that can identically be found in mi/miexpose.c.