Switch back to using exact version numbers instead of an MSBuild property

build/SharpDX.props

@@ -1,12 +1,9 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <SharpDXVersion>4.0.1</SharpDXVersion>
-  </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="SharpDX" Version="$(SharpDXVersion)" />
-    <PackageReference Include="SharpDX.Direct2D1" Version="$(SharpDXVersion)" />
-    <PackageReference Include="SharpDX.Direct3D11" Version="$(SharpDXVersion)" />
-    <PackageReference Include="SharpDX.DXGI" Version="$(SharpDXVersion)" />
-    <PackageReference Include="SharpDX.Direct3D9" Version="$(SharpDXVersion)" Condition="'$(UseDirect3D9)' == 'true'" />
+    <PackageReference Include="SharpDX" Version="4.0.1" />
+    <PackageReference Include="SharpDX.Direct2D1" Version="4.0.1" />
+    <PackageReference Include="SharpDX.Direct3D11" Version="4.0.1" />
+    <PackageReference Include="SharpDX.DXGI" Version="4.0.1" />
+    <PackageReference Include="SharpDX.Direct3D9" Version="4.0.1" Condition="'$(UseDirect3D9)' == 'true'" />
   </ItemGroup>
 </Project>