Merge pull request #447 from SylvainCorlay/vs2015-syntax-error

Fix VS 2015 syntax error with macro

Author: sigiesec

zmq.hpp

@@ -61,7 +61,7 @@
 #define ZMQ_CPP17
 #endif
 
-#if defined(ZMQ_CPP14)
+#if defined(ZMQ_CPP14) && !defined(_MSC_VER)
 #define ZMQ_DEPRECATED(msg) [[deprecated(msg)]]
 #elif defined(_MSC_VER)
 #define ZMQ_DEPRECATED(msg) __declspec(deprecated(msg))