Revert "Store the font's scalability in QFontEngine."

This reverts commit 65b12fbdb1.

QFontEngine is not always loaded from QFontDatabase, resulting in
the flag not being set.

Change-Id: I39bc5bd4a8dea153d191cfc55f4324195f75f64c
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/gui/text/qfontdatabase_qpa.cpp

@@ -184,7 +184,6 @@ QFontEngine *loadSingleEngine(int script,
     if (!engine) {
         engine = pfdb->fontEngine(def, QChar::Script(script), size->handle);
         if (engine) {
-            engine->smoothScalable = style->smoothScalable;
             QFontCache::Key key(def,script);
             QFontCache::instance()->instance()->insertEngine(key,engine);
         }

src/gui/text/qfontengine.cpp

@@ -208,8 +208,7 @@ Q_AUTOTEST_EXPORT QList<QFontEngine *> QFontEngine_stopCollectingEngines()
 QFontEngine::QFontEngine()
     : ref(0),
       font_(0), font_destroy_func(0),
-      face_(0), face_destroy_func(0),
-      smoothScalable(false)
+      face_(0), face_destroy_func(0)
 {
     cache_cost = 0;
     fsType = 0;

src/gui/text/qfontengine_p.h

@@ -302,8 +302,6 @@ public:
 
     inline QVariant userData() const { return m_userData; }
 
-    bool smoothScalable;
-
 protected:
     QFixed lastRightBearing(const QGlyphLayout &glyphs, bool round = false);