We build packages with extra debug info, but sign the application before
removing the debug info for the release package.
We have to codesign (potentially again) between copying and packaging.
Task-number: QTCREATORBUG-20370
Change-Id: I5549ca5045eb995e5a61794473c2d0180b778711
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>