Compile fix with recent Qt dev

The reasoning in 1b4766e26c did not take into account that the scope
of QT_NO_JAVA_STYLE_ITERATORS may change over time, as done with
f70905448f6 in Qt base.

Change-Id: Ib1966ff26c4d36d5f62e149d6b45baa4aecf825d
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/clangtools/clangtoolruncontrol.cpp

@@ -356,9 +356,7 @@ void ClangToolRunControl::start()
 
 void ClangToolRunControl::stop()
 {
-    QSetIterator<ClangToolRunner *> i(m_runners);
-    while (i.hasNext()) {
-        ClangToolRunner *runner = i.next();
+    for (ClangToolRunner *runner : m_runners) {
         QObject::disconnect(runner, nullptr, this, nullptr);
         delete runner;
     }