thirdparty/dxsdk_aug2007: Bundle D3D8 headers from Aug 2007 DirectX SDK.

A bit of a grey area but common practice according to Microsoft: https://web.archive.org/web/20170322105210/https://blogs.msdn.microsoft.com/chuckw/2015/03/23/the-zombie-directx-sdk/ These headers are only used with MSVC. And they greatly simplify building apitrace for Windows, since modern Windows SDK include all necessary headers except D3D8's.
KDABLabs · Mar 22, 2017 · 8f55cb5 · 8f55cb5
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diff --git a/cmake/FindDirectX.cmake b/cmake/FindDirectX.cmake
@@ -103,7 +103,13 @@ if (WIN32)
 
     find_winsdk_header  (D3D     d3d.h)
 
-    find_dxsdk_header   (D3D8    d3d8.h)
+    if (MSVC)
+        set (DirectX_D3D8_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/thirdparty/dxsdk_aug2007)
+        set (DirectX_D3D8_INCLUDE_FOUND TRUE)
+        mark_as_advanced (DirectX_D3D8_INCLUDE_FOUND)
+    else ()
+        find_dxsdk_header   (D3D8    d3d8.h)
+    endif ()
 
     find_winsdk_header  (D3D9    d3d9.h)
 

diff --git a/docs/INSTALL.markdown b/docs/INSTALL.markdown
@@ -141,11 +141,6 @@ Additional requirements:
 * [Windows 10 SDK](https://dev.windows.com/en-us/downloads/windows-10-sdk)
   for D3D11.3 headers.
 
-* Microsoft DirectX SDK is now part of Microsoft Visual Studio (from version
-  2012), but D3D8 headers are not included, so if you want D3D8 support you'll
-  need to donwload and install the
-  [August 2007 release of DirectX SDK](https://www.microsoft.com/en-gb/download/details.aspx?id=13287)
-
 ### CMake GUI ###
 
 To build with Visual Studio first open a Command Prompt window (*not* Visual