Adapt to MSVC linker

httpserver/httpconnectionhandler.h

@@ -18,6 +18,8 @@
 #include "httprequesthandler.h"
 #include "httplistenersettings.h"
 
+#include "util/export.h"
+
 namespace qtwebapp {
 
 /** Alias type definition, for compatibility to different Qt versions */
@@ -47,7 +49,7 @@ namespace qtwebapp {
   The readTimeout value defines the maximum time to wait for a complete HTTP request.
   @see HttpRequest for description of config settings maxRequestSize and maxMultiPartSize.
 */
-class DECLSPEC HttpConnectionHandler : public QThread {
+class HTTPSERVER_API HttpConnectionHandler : public QThread {
     Q_OBJECT
     Q_DISABLE_COPY(HttpConnectionHandler)