Fixed duplicated SlimDX refs

Vocaluxe/Vocaluxe.csproj

@@ -144,12 +144,6 @@
     <DefineConstants>WIN;ARCH_X64;INSTALLER</DefineConstants>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
-  <ItemGroup Condition="'$(Platform)' == 'x64' And ('$(Configuration)' == 'DebugWin' Or '$(Configuration)' == 'ReleaseWin' Or '$(Configuration)' == 'InstallerWin')">
-    <Reference Include="SlimDX">
-      <HintPath>..\Output\x64\SlimDX.dll</HintPath>
-      <Private>False</Private>
-    </Reference>
-  </ItemGroup>
   <ItemGroup>
     <Reference Include="AForge.Video, Version=2.2.5.0, Culture=neutral, PublicKeyToken=cbfb6e07d173c401, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>