qmlimportscanner: Print usage when no arguments are passed.

Change-Id: I2ba5e18fff635705b1f5e8e19c104ba078c8e3a1
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Fix WinCE build.

Change-Id: Ie0536ad94f88efe1e54226ed7f1d9e1042ffcc19
Reviewed-by: Lars Knoll <lars.knoll@digia.com>