qmake: eradicate Q_FOREACH loops [rvalues]

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

This is the simplest of the patch series: Q_FOREACH took a
copy, so we do, too. Except we don't, since we're just
catching the return value that comes out of the function
(RVO). We can't feed the rvalues into range-for, because
they are non-const and would thus detach.

Change-Id: I5834620bf82f3442da7b2838363d351a0fb960a0
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
(cherry picked from qtbase/8d7e913248aa1cad23447668d98911bba01faf4b)
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/shared/proparser/qmakeglobals.cpp

@@ -313,7 +313,8 @@ bool QMakeGlobals::initProperties()
         QT_PCLOSE(proc);
     }
 #endif
-    foreach (QByteArray line, data.split('\n')) {
+    const auto lines = data.split('\n');
+    for (QByteArray line : lines) {
         int off = line.indexOf(':');
         if (off < 0) // huh?
             continue;