Fixes: bin dir of msvc qt versions was not added to the path

The setting of msvc environments variables overwrote that. Fix that by running the script with the correct environment.

src/libs/cplusplus/pp-engine.cpp

@@ -1,5 +1,4 @@
-/**************************************************************************
-**
+/**
 ** This file is part of Qt Creator
 **
 ** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
@@ -51,6 +50,7 @@
 #include <Lexer.h>
 #include <Token.h>
 #include <Literals.h>
+#include <cctype>
 
 #include <QtDebug>
 #include <algorithm>