Delete outdated workaround (#1921)

Author: jkotas

src/libraries/Microsoft.CSharp/src/Microsoft.CSharp.csproj

@@ -2,8 +2,6 @@
   <PropertyGroup>
     <AssemblyName>Microsoft.CSharp</AssemblyName>
     <RootNamespace>Microsoft.CSharp</RootNamespace>
-    <!-- dotnet/corefx#3128 tracks removing this exclusion -->
-    <ExcludeLocalizationImport Condition="'$(TargetsWindows)' != 'true'">true</ExcludeLocalizationImport>
     <Configurations>netstandard2.0-Debug;netstandard2.0-Release</Configurations>
   </PropertyGroup>
   <ItemGroup>
@@ -175,4 +173,4 @@
     <Reference Include="System.Runtime.InteropServices" />
     <Reference Include="System.Threading" />
   </ItemGroup>
-</Project>
+</Project>