Since commit 20e9422e we don't ignore exit codes when installing files
anymore. This patch does the same for meta file installation. We
really should be notified properly if something goes wrong here.
Task-number: QTBUG-18870
Change-Id: Ib6a20293380f400379b10ec767bf38dc74d5beeb
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>