Fix warning MSVC C4390

';' : empty controlled statement found; is this the intent?

In this case, it is indeed the intent.

Author: dirk-zimoch

src/rpcClient/rpcClient.cpp

@@ -24,6 +24,9 @@
 #  define TRACE(msg) std::cerr<<"TRACE: "<<CURRENT_FUNCTION<<" : "<< msg <<"\n"
 #else
 #  define TRACE(msg)
+#  ifdef _MSC_VER
+#    pragma warning(disable:4390)
+#  endif
 #endif
 
 namespace pvd = epics::pvData;