Remove workaround for 1610 as it no longer repros.

Update docs.

Author: JeremyKuhne

Documentation/unix-instructions.md

@@ -71,8 +71,6 @@ PDBs aren't generated by Roslyn on Unix. https://github.com/dotnet/roslyn/issues
 
 Test runs are currently disabled when building on Unix. https://github.com/dotnet/corefx/issues/1776
 
-System.Diagnostics.FileVersionInfo.Tests.csproj does not build on Unix. https://github.com/dotnet/corefx/issues/1610
-
 System.Diagnostics.Debug.Tests does not build on Unix. https://github.com/dotnet/corefx/issues/1609
 
 Mono fails when trying to get custom attributes on CoreFx assemblies. https://bugzilla.xamarin.com/show_bug.cgi?id=29679

dir.props

@@ -92,11 +92,6 @@
       https://github.com/dotnet/corefx/issues/1609
     -->
     <ExcludeProjects Include="System.Diagnostics.Debug/tests/System.Diagnostics.Debug.Tests.csproj" />
-    <!--
-      The OpenSourceSign target complains about System.Diagnostics.FileVersionInfo.TestAssembly.dll not being delay signed.
-      https://github.com/dotnet/corefx/issues/1610
-    -->
-    <ExcludeProjects Include="System.Diagnostics.FileVersionInfo/tests/System.Diagnostics.FileVersionInfo.Tests.csproj" />
   </ItemGroup>
 
   <PropertyGroup Condition="'$(OsEnvironment)'=='Unix'">