update slimdx link

build.md

@@ -3,20 +3,17 @@ Builds with CMake 2.8 or later.
 
 This project is primarily written for GCC; an MSVC solution is also maintained. There are no compiler specific defines or inline assembler used, but attention should be paid to abstracting calling conventions and the C++ ABI properly.
 
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 Build outputs:
 
 d3d8.dll, intercepts standard Morrowind D3D functions and adds features.
 dinput8.dll, a shim dll that redirects input to d3d8.dll, as all input processing functions are in d3d8.dll.
 MGEXEgui, a .net GUI that configures MGE and generates the distant world files that allows long view ranges.
 MGEfuncs.dll, a helper dll for MGEXEgui that processes Morrowind format models with niflib/tootlelib.
 
-
 Build dependencies required:
 
-DirectX SDK June 2010 or later: http://msdn.microsoft.com/en-us/directx/
-SlimDX: http://slimdx.org/
-
+DirectX SDK June 2010 or later: <http://msdn.microsoft.com/en-us/directx/>
+SlimDX: <https://code.google.com/archive/p/slimdx/downloads>
 
 Runtime dependencies required: