linuxfb plugin: eradicate Q_FOREACH loops

... by replacing them with C++11 range-for loops.

Then mark the plugin as QT_NO_FOREACH.

Change-Id: I80a18334b1e0c5bbd44dfe45eea80591d478a8d6
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

src/plugins/platforms/linuxfb/linuxfb.pro

@@ -1,5 +1,7 @@
 TARGET = qlinuxfb
 
+DEFINES += QT_NO_FOREACH
+
 QT += core-private gui-private platformsupport-private
 
 SOURCES = main.cpp qlinuxfbintegration.cpp qlinuxfbscreen.cpp

src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp

@@ -320,7 +320,7 @@ bool QLinuxFbScreen::initialize()
     bool doSwitchToGraphicsMode = true;
 
     // Parse arguments
-    foreach (const QString &arg, mArgs) {
+    for (const QString &arg : qAsConst(mArgs)) {
         QRegularExpressionMatch match;
         if (arg == QLatin1String("nographicsmodeswitch"))
             doSwitchToGraphicsMode = false;