Update ENet-CSharp.csproj

Source/Managed/ENet-CSharp.csproj

@@ -3,16 +3,17 @@
   <PropertyGroup>
     <OutputType>Library</OutputType>
     <TargetFrameworks>netstandard2.0;netcoreapp2.0</TargetFrameworks>
+    <Platforms>x64</Platforms>
     <RootNamespace>ENet</RootNamespace>
     <LangVersion>3</LangVersion>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <Optimize>false</Optimize>
     <CheckForOverflowUnderflow>True</CheckForOverflowUnderflow>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Optimize>true</Optimize>
     <CheckForOverflowUnderflow>False</CheckForOverflowUnderflow>
   </PropertyGroup>