Move System.IO.Compression in ProjectK from closed to open source implementation.

Improvements in open source implemenation include
- Fix DD1178196 bug in DeflateStream causes assert in DeflaterZLib.IDeflater.Finish
- Performance improvements for asynchronous operations
- Unix support

[tfs-changeset: 1494471]

Author: Matt Cohn

src/System.IO.Compression/src/System.IO.Compression.csproj

@@ -1,10 +1,15 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
+  <PropertyGroup>
+    <!-- Required due to https://github.com/dotnet/corefx/issues/2171 -->
+    <AssemblyKeyType>ECMA</AssemblyKeyType>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
     <Configuration Condition="'$(Configuration)' == ''">Windows_Debug</Configuration>
     <Platform Condition="'$(Platform)' == ''">AnyCPU</Platform>
     <AssemblyName>System.IO.Compression</AssemblyName>
+    <AssemblyVersion>4.0.0.0</AssemblyVersion>
     <OutputType>Library</OutputType>
     <ProjectGuid>{5471BFE8-8071-466F-838E-5ADAA779E742}</ProjectGuid>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>