Revert "THRIFT-4982 Remove deprecated C# bindings from the code base"

Only compiler, test, lib and tutorial code.
diff --git a/compiler/cpp/compiler.vcxproj b/compiler/cpp/compiler.vcxproj
index dc9793f..cbcf8ea 100644
--- a/compiler/cpp/compiler.vcxproj
+++ b/compiler/cpp/compiler.vcxproj
@@ -57,6 +57,7 @@
     <ClCompile Include="src\thrift\generate\t_c_glib_generator.cc" />
     <ClCompile Include="src\thrift\generate\t_cl_generator.cc" />
     <ClCompile Include="src\thrift\generate\t_cpp_generator.cc" />
+    <ClCompile Include="src\thrift\generate\t_csharp_generator.cc" />
     <ClCompile Include="src\thrift\generate\t_d_generator.cc" />
     <ClCompile Include="src\thrift\generate\t_dart_generator.cc" />
     <ClCompile Include="src\thrift\generate\t_delphi_generator.cc" />