Unify Windows.h inclusion

Windows.h must be included first and must be included with care
regarding WinSock.h and WinSock2.h affair.

Signed-off-by: Simon Rozman <simon@rozman.si>

lib/libZRCola/include/zrcola/common.h

@@ -19,14 +19,15 @@
 
 #pragma once
 
+#ifdef _WIN32
+#define _WINSOCKAPI_    // Prevent inclusion of winsock.h in windows.h.
+#include <Windows.h>
+#endif
 #include <sal.h>
 #include <istream>
 #include <ostream>
 #include <utility>
 #include <vector>
-#ifdef _WIN32
-#include <Windows.h>
-#endif
 
 
 #pragma warning(push)