don't error out on static builds

commit daa8e22 made it actually work, but apparently forgot to re-enable
it.

Task-number: QTBUG-35843
Change-Id: Ib782634a4b1916e25e22f0b4c4f7bf42bf92b52f
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>