Remove the platformsSection constant from qconfig.cpp.in

This is not configurable and doesn't have to be in the generated
q[make]config.cpp files.

Change-Id: If294d735800a3b5c6b3e269abdd86df401cf4864
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

qmake/qmakelibraryinfo.cpp

@@ -110,7 +110,7 @@ void QMakeLibrarySettings::load()
                 haveEffectiveSourcePaths || children.contains(QLatin1String("EffectivePaths"));
         // Backwards compat: an existing but empty file is claimed to contain the Paths section.
         havePaths = (!haveDevicePaths && !haveEffectivePaths
-                     && !children.contains(QLatin1String(platformsSection)))
+                     && !children.contains(QLatin1String("Platforms")))
                 || children.contains(QLatin1String("Paths"));
     } else {
         haveDevicePaths = false;

src/corelib/global/qconfig.cpp.in

@@ -98,5 +98,3 @@ static const struct {
     { "HostPrefix", "" },
 #endif
 };
-
-static const char platformsSection[] = "Platforms";

src/corelib/global/qlibraryinfo.cpp

@@ -122,7 +122,7 @@ void QLibrarySettings::load()
         haveEffectivePaths = haveEffectiveSourcePaths || children.contains(QLatin1String("EffectivePaths"));
         // Backwards compat: an existing but empty file is claimed to contain the Paths section.
         havePaths = (!haveDevicePaths && !haveEffectivePaths
-                     && !children.contains(QLatin1String(platformsSection)))
+                     && !children.contains(QLatin1String("Platforms")))
                     || children.contains(QLatin1String("Paths"));
         if (!havePaths)
             settings.reset(nullptr);
@@ -594,7 +594,7 @@ QStringList QLibraryInfo::platformPluginArguments(const QString &platformName)
 #if QT_CONFIG(settings)
     QScopedPointer<const QSettings> settings(QLibraryInfoPrivate::findConfiguration());
     if (!settings.isNull()) {
-        const QString key = QLatin1String(platformsSection)
+        const QString key = QLatin1String("Platforms")
                 + QLatin1Char('/')
                 + platformName
                 + QLatin1String("Arguments");