systemEnvironment(): the loop was iterating over a temporary; hold the
temporary in a local const auto variable and use ranged-for.
runCommand(): the container is a const&, the loop doesn't change the
container and the containers the method is called on aren't changed
during iteration.
Task-number: QTBUG-115839
Change-Id: I6687e5ff64ff8c2fa26e34abf4044b98718e65d4
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
7101dcab7a