Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/tools/sdktool/addkitoperation.cpp

@@ -715,7 +715,7 @@ QVariantMap AddKitData::addKit(const QVariantMap &map,
     data << KeyValuePair(COUNT, QVariant(count + 1));
 
     KeyValuePairList qtExtraList;
-    for (const KeyValuePair &pair : qAsConst(m_extra))
+    for (const KeyValuePair &pair : std::as_const(m_extra))
         qtExtraList << KeyValuePair(QStringList() << kit << pair.key, pair.value);
     data.append(qtExtraList);