Win32: add lz4 support (using NuGet lz4 package)

README.win32

@@ -10,6 +10,8 @@ Requirements:
    (This would be using NuGet too but the current
     OpenSSL packages are outdated and with broken
 	dependencies, so no luck)
+ * lz4 is installed automatically from NuGet.
+   xxhash.[ch] from lz4 are used instead of the ones provided by librdkafka.
 
 
 The Visual Studio solution file for librdkafka resides in win32/librdkafka.sln
@@ -23,7 +25,6 @@ Artifacts:
  Missing:
   - remaining tools (rdkafka_performance, etc)
   - SASL support (no official Cyrus libsasl2 DLLs available)
-  - LZ4 support
 
 If you build librdkafka with an external tool (ie CMake) you can get rid of the 
 __declspec(dllexport) / __declspec(dllimport) decorations by adding a define

src/win32_config.h

@@ -34,5 +34,6 @@
 #define WITH_SSL 1
 #define WITH_ZLIB 1
 #define WITH_SNAPPY 1
+#define WITH_LZ4 1
 
 #define ENABLE_DEVEL 0

win32/librdkafka.vcxproj

@@ -202,7 +202,6 @@
     <ClInclude Include="..\src\tinycthread.h" />
     <ClInclude Include="..\src\rdwin32.h" />
     <ClInclude Include="..\src\win32_config.h" />
-    <ClInclude Include="..\src\xxhash.h" />
     <ClInclude Include="..\src\regexp.h" />
   </ItemGroup>
   <ItemGroup>
@@ -238,7 +237,6 @@
     <ClCompile Include="..\src\rdregex.c" />
     <ClCompile Include="..\src\snappy.c" />
     <ClCompile Include="..\src\tinycthread.c" />
-    <ClCompile Include="..\src\xxhash.c" />
     <ClCompile Include="..\src\regexp.c" />
   </ItemGroup>
   <ItemGroup>
@@ -252,6 +250,7 @@
   <ImportGroup Label="ExtensionTargets">
     <Import Project="packages\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.targets" Condition="Exists('packages\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.targets')" />
     <Import Project="packages\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.targets" Condition="Exists('packages\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.targets')" />
+    <Import Project="packages\lz4.1.3.1.2\build\native\lz4.targets" Condition="Exists('packages\lz4.1.3.1.2\build\native\lz4.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -259,5 +258,6 @@
     </PropertyGroup>
     <Error Condition="!Exists('packages\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v120.windesktop.msvcstl.dyn.rt-dyn.targets'))" />
     <Error Condition="!Exists('packages\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.1.2.8.8\build\native\zlib.v140.windesktop.msvcstl.dyn.rt-dyn.targets'))" />
+    <Error Condition="!Exists('packages\lz4.1.3.1.2\build\native\lz4.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\lz4.1.3.1.2\build\native\lz4.targets'))" />
   </Target>
-</Project>
+</Project>
\ No newline at end of file

win32/packages.config

 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="lz4" version="1.3.1.2" targetFramework="native" />
   <package id="zlib" version="1.2.8.8" targetFramework="Native" />
   <package id="zlib.v120.windesktop.msvcstl.dyn.rt-dyn" version="1.2.8.8" targetFramework="Native" />
   <package id="zlib.v140.windesktop.msvcstl.dyn.rt-dyn" version="1.2.8.8" targetFramework="Native" />