linux fix + unittest works with Linux

test/build_linux.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+#
+# Author: Benjamin Sergeant
+# Copyright (c) 2017-2018 Machine Zone, Inc. All rights reserved.
+#
+
+# 'manual' way of building. You can also use cmake.
+
+g++ --std=c++11 \
+    -DIXWEBSOCKET_USE_TLS \
+    -g \
+    ../ixwebsocket/IXEventFd.cpp	\
+    ../ixwebsocket/IXSocket.cpp	\
+    ../ixwebsocket/IXSetThreadName.cpp	\
+    ../ixwebsocket/IXWebSocketTransport.cpp \
+    ../ixwebsocket/IXWebSocket.cpp \
+    ../ixwebsocket/IXWebSocketServer.cpp \
+    ../ixwebsocket/IXDNSLookup.cpp \
+    ../ixwebsocket/IXSocketConnect.cpp \
+    ../ixwebsocket/IXSocketOpenSSL.cpp \
+    ../ixwebsocket/IXWebSocketPerMessageDeflate.cpp \
+    ../ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp \
+    -I ../.. \
+    -I Catch2/single_include \
+    test_runner.cpp \
+    cmd_websocket_chat.cpp \
+    IXTest.cpp \
+    msgpack11.cpp \
+    -o ixwebsocket_unittest \
+    -lcrypto -lssl -lz -lpthread