fix static build issue
fix static build issue

Change-Id: Id31a99084d687c970cba07ec7ba1b50e25a54901
Reviewed-on: http://cr.qtquick.me/724
Tested-by: http://ci.qtquick.me/
Reviewed-by: Tasuku Suzuki <42980d970444f9101663582e70cd53623b3238b4@gmail.com>
Tested-by: Tasuku Suzuki <42980d970444f9101663582e70cd53623b3238b4@gmail.com>

qt-users-jp/qthttpserver,qt-users-jp/qthttpserver