MSVC: Do not overwrite build environment with result from Probe
MSVC: Do not overwrite build environment with result from Probe

We want to amend it instead.

Task-number: QBS-1038
Change-Id: Ib1b87b654d92911473cd03f9c32243a54fb98635
Reviewed-by: Jake Petroules <2d627e1cecd5435752fa500bacbe05f7cc90c369@qt.io>
Reviewed-by: Kai Koehne <077bc265216106fb22408e62f2d97925ede69d10@qt.io>

qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs