THRIFT-5185: Support for using WebSockets as a server transport

Client: cpp
diff --git a/lib/cpp/CMakeLists.txt b/lib/cpp/CMakeLists.txt
index d705bb3..29caad4 100755
--- a/lib/cpp/CMakeLists.txt
+++ b/lib/cpp/CMakeLists.txt
@@ -57,6 +57,8 @@
    src/thrift/transport/TServerSocket.cpp
    src/thrift/transport/TTransportUtils.cpp
    src/thrift/transport/TBufferTransports.cpp
+   src/thrift/transport/TWebSocketServer.h
+   src/thrift/transport/TWebSocketServer.cpp
    src/thrift/server/TConnectedClient.cpp
    src/thrift/server/TServerFramework.cpp
    src/thrift/server/TSimpleServer.cpp