QtGui: port the last remaining Q_FOREACH loops and add QT_NO_FOREACH

Port the last two remaining Q_FOREACH users in QtGui
to C++11 range-for and mark the library as Q_FOREACH
-free, using QT_NO_FOREACH.

Change-Id: Ie6c5eea0af4227af6ef3dc0b4da2cf62e09d8b52
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

src/gui/gui.pro

@@ -3,7 +3,7 @@ QT = core-private
 
 qtConfig(opengl.*): MODULE_CONFIG = opengl
 
-DEFINES   += QT_NO_USING_NAMESPACE
+DEFINES   += QT_NO_USING_NAMESPACE QT_NO_FOREACH
 
 QMAKE_DOCS = $$PWD/doc/qtgui.qdocconf
 

src/gui/image/qpnghandler.cpp

@@ -745,7 +745,7 @@ static void set_text(const QImage &image, png_structp png_ptr, png_infop info_pt
 
 #ifdef PNG_iTXt_SUPPORTED
         bool needsItxt = false;
-        foreach(const QChar c, it.value()) {
+        for (const QChar c : it.value()) {
             uchar ch = c.cell();
             if (c.row() || (ch < 0x20 && ch != '\n') || (ch > 0x7e && ch < 0xa0)) {
                 needsItxt = true;

src/gui/painting/qcoregraphics.mm

@@ -133,7 +133,7 @@ NSImage *qt_mac_create_nsimage(const QIcon &icon, int defaultSize)
     QList<QSize> availableSizes = icon.availableSizes();
     if (availableSizes.isEmpty() && defaultSize > 0)
         availableSizes << QSize(defaultSize, defaultSize);
-    foreach (QSize size, availableSizes) {
+    for (QSize size : qAsConst(availableSizes)) {
         QPixmap pm = icon.pixmap(size);
         if (pm.isNull())
             continue;