Xming X Server for Windows

Update Plink from its project git repository, and the xserver, libXt and Mesa from X.Org git.
Update the OpenGL extension headers and specifications from the canonical OpenGL Registry for use in the X server build (Khronos SVN at revision 29593).
Update bison to release 3.0.4 in the build toolchain.
Xming 7.5.0.89 (Released 24 Jan 2015).

I've tested using MinGW-w64's winpthreads as a replacement for Pthreads-Win32 (which is still an active project) and have not yet found a good reason to switch e.g. mutexes appear to be slower and C++11 support isn't needed.
XLaunch's XPing and -find don't work yet with IPv6. Plus testing of XDMCP on IPv6 networks has not been very extensive
Fix a 'borders black, corrupted or missing' rendering error in -mwextwm mode e.g. with xcalc and oclock (tricky). An API change (13/9/07 'Remove the PaintWindow optimization') seems to be the cause.
Get -pseudocolor to work with the various engines (I need an antique 8-bit colour Unix system to progress this). As a workaround use -fullscreen at -depth 8.
Fully utilize the MPX code so that multiple mice and keyboards work with the X server (the MPX code is currently forced/bypassed to be single mouse/keyboard).

Update Plink and FreeType2 from their project git repositories, and the xserver, bitmap, ico, libfontenc, libXdmcp, Mesa, xauth, xkeyboard-config, xsetroot and xwininfo from X.Org git. Includes fixes for CVE-2014-8091..8103.
Use Jon Turney's format specifier fix for vpnprinf(), in xserver/os/log.c, instead of my workaround patch used from 7.5.0.84 (Jon's fix is pending X.Org approval).
Correct the Windows title of the 'Enter Credentials' dialog in Plink.
Update the OpenGL extension headers and specifications from the canonical OpenGL Registry for use in the X server build (Khronos SVN at revision 29564).
Update bison to release 3.0.3 in the build toolchain.
Xming 7.5.0.88 (Released 29 Nov 2014).

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