milou: Fix build error

Summary:
To fix:
error: 'QTextStream' was not declared in this scope

QTextStream stream(&file)

apply a patch that has been accepted (but not merged) in the upstream
project.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: broulik

Differential Revision: https://phabricator.kde.org/D14170