[Win32] Add double-dispose guard in DestroyableImageHandle.destroy()#3243

HeikoKlare merged 1 commit intoeclipse-platform:mastereclipse-platform/eclipse.platform.swt:masterfrom

HeikoKlare:fix-win32-image-double-disposeHeikoKlare/eclipse.platform.swt:fix-win32-image-double-disposeCopy head branch name to clipboard