QtIFW

Print component warnings only in verbose mode

If there are lot of components, it takes a lot of time to check every
component for their errors. Print those only when --verbose given in
command line.

Task-number: QTIFW-975
Change-Id: If9467416d5d8f3417cd30262f95e91308a79e7a6
Reviewed-by: Iikka Eklund <iikka.eklund@qt.io>