don't send output of $$join() and $$sprintf() through split_value_list()
don't send output of $$join() and $$sprintf() through split_value_list()

in the case of sprintf it's surprising, in the case of join it's
anti-thetical.

Change-Id: I4eb7e56d31ac6ed68adf852f1a19b33554d38eb4
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@digia.com>
Reviewed-by: Oswald Buddenhagen <6a8868beda3e139b5ac22b2534a23d3e6ba81819@digia.com>
(cherry picked from qtbase/ae94bf2b7a6373def9239ae5f54b143e1f6ffe09)

mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools