windows/gdi: Remove.

This classic driver is so far behind Gallium softpipe/llvmpipe based
one, that's hard to imagine ever being useful.

v2: Drop drivers/windows from src/mesa/Makefile.am:EXTRA_DIST per Emil
Velikov.

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

v3: Update release notes.
diff --git a/docs/README.WIN32 b/docs/README.WIN32
index c8759f6..e0e5b9b 100644
--- a/docs/README.WIN32
+++ b/docs/README.WIN32
@@ -11,9 +11,9 @@
 
 Run
 
-  scons osmesa mesagdi
+  scons osmesa
 
-to build classic mesa Windows GDI drivers; or
+to build classic osmesa driver; or
 
   scons libgl-gdi
 
diff --git a/docs/install.html b/docs/install.html
index b12e1cb..9dbfce5 100644
--- a/docs/install.html
+++ b/docs/install.html
@@ -127,14 +127,13 @@
 To build Mesa with SCons for Windows on Linux using the MinGW crosscompiler toolchain do
 </p>
 <pre>
-    scons platform=windows toolchain=crossmingw machine=x86 mesagdi libgl-gdi
+    scons platform=windows toolchain=crossmingw machine=x86 libgl-gdi
 </pre>
 <p>
 This will create:
 </p>
 <ul>
-<li>build/windows-x86-debug/mesa/drivers/windows/gdi/opengl32.dll &mdash; Mesa + swrast, binary compatible with Windows's opengl32.dll
-<li>build/windows-x86-debug/gallium/targets/libgl-gdi/opengl32.dll &mdash; Mesa + Gallium + softpipe, binary compatible with Windows's opengl32.dll
+<li>build/windows-x86-debug/gallium/targets/libgl-gdi/opengl32.dll &mdash; Mesa + Gallium + softpipe (or llvmpipe), binary compatible with Windows's opengl32.dll
 </ul>
 <p>
 Put them all in the same directory to test them.
diff --git a/docs/relnotes/10.6.0.html b/docs/relnotes/10.6.0.html
index ceeca07..bf29ebb 100644
--- a/docs/relnotes/10.6.0.html
+++ b/docs/relnotes/10.6.0.html
@@ -58,7 +58,9 @@
 
 <h2>Changes</h2>
 
-TBD.
+<ul>
+<li>Removed classic Windows software rasterizer.</li>
+</ul>
 
 </div>
 </body>