Sign all assemblies with key

src/Microsoft.PowerShell.Security/AssemblyInfo.cs

@@ -6,8 +6,3 @@ using System.Resources;
 
 [assembly:AssemblyCulture("")]
 [assembly:NeutralResourcesLanguage("en-US")]
-
-#if !CORECLR
-[assembly:AssemblyKeyFileAttribute(@"..\signing\visualstudiopublic.snk")]
-[assembly:AssemblyDelaySignAttribute(true)]
-#endif

src/Microsoft.PowerShell.Security/project.json

@@ -4,6 +4,9 @@
     "authors": [ "garretts", "andschwa" ],
 
     "buildOptions": {
+        "keyFile": "../signing/visualstudiopublic.snk",
+        "delaySign": true,
+        "publicSign": false,
         "warningsAsErrors": true,
         "allowUnsafe": true
     },