Fix executable to be WIN32 on windows

Source/WXDialog/CMakeLists.txt

@@ -19,7 +19,11 @@ IF ( CMAKE_WX_CAN_COMPILE )
 
   INCLUDE_DIRECTORIES(${CMake_SOURCE_DIR}/Source)
 
-  ADD_EXECUTABLE(wxCMakeSetup ${WX_SRCS})
+  IF(WIN32)
+    SET(WIN32_EXECUTABLE WIN32)
+  ENDIF(WIN32)
+
+  ADD_EXECUTABLE(wxCMakeSetup ${WIN32_EXECUTABLE} ${WX_SRCS})
   TARGET_LINK_LIBRARIES(wxCMakeSetup ${WXWINDOWS_LIBRARY})
   TARGET_LINK_LIBRARIES(wxCMakeSetup CMakeLib)