Work around old Clang bug parsing of NSDMI referring to members

Clang pre-3.4 didn't like this and it's used in Xcode 5.1 (which we need
to support for 5.8).

error: 'this' cannot be implicitly captured in this context
    typename T::const_iterator i = c.begin(), e = c.end();
                                   ^

Task-number: QTBUG-57488
Change-Id: I63e21df51c7448bc8b5ffffd148e688d7c9b89d6
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

src/corelib/global/qglobal.h

@@ -921,10 +921,10 @@ template <typename T>
 class QForeachContainer {
     QForeachContainer &operator=(const QForeachContainer &) Q_DECL_EQ_DELETE;
 public:
-    QForeachContainer(const T &t) : c(t) {}
-    QForeachContainer(T &&t) : c(std::move(t)) {}
+    QForeachContainer(const T &t) : c(t), i(c.begin()), e(c.end()) {}
+    QForeachContainer(T &&t) : c(std::move(t)), i(c.begin()), e(c.end())  {}
     const T c;
-    typename T::const_iterator i = c.begin(), e = c.end();
+    typename T::const_iterator i, e;
     int control = 1;
 };