MSVC detection: Account for random Windows file name case.
MSVC detection: Account for random Windows file name case.

Change-Id: Ib953a5ad3a935e86bcaac318d61c4975a4cb7c08
Reviewed-by: Jake Petroules <2d627e1cecd5435752fa500bacbe05f7cc90c369@theqtcompany.com>

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