Add netcoreapp2.1 build for System.Net.WebSockets.WebSocketProtocol

Commit migrated from https://github.com/dotnet/corefx/commit/0cb09ad87ce1e685700430d8065a6285af7ad1ae

diff --git a/src/libraries/System.Net.WebSockets.WebSocketProtocol/src/Configurations.props b/src/libraries/System.Net.WebSockets.WebSocketProtocol/src/Configurations.props
index 77a4b65..f598331 100644 (file)
--- a/src/libraries/System.Net.WebSockets.WebSocketProtocol/src/Configurations.props
+++ b/src/libraries/System.Net.WebSockets.WebSocketProtocol/src/Configurations.props
@@ -1,8 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <BuildConfigurations>
+    <PackageConfigurations>
       netstandard;
+      netcoreapp2.1;
+    </PackageConfigurations>
+    <BuildConfigurations>
+      $(PackageConfigurations);
       netcoreapp;
     </BuildConfigurations>
   </PropertyGroup>