workaround "Signals are protected in qt4"

cockatrice/src/carddatabase.h

@@ -137,6 +137,7 @@ public:
     void setCustomPicURL(const QString &_set, const QString &_customPicURL) { customPicURLs.insert(_set, _customPicURL); }
     void setMuId(const QString &_set, const int &_muId) { muIds.insert(_set, _muId); }
     void addToSet(CardSet *set);
+    void emitPixmapUpdated() { emit pixmapUpdated(); }
 
     /**
      * Simplify a name to have no punctuation and lowercase all letters, for

cockatrice/src/pictureloader.cpp

@@ -415,7 +415,7 @@ void PictureLoader::imageLoaded(CardInfo *card, const QImage &image)
         QPixmapCache::insert(card->getPixmapCacheKey(), QPixmap::fromImage(image));
     }
 
-    emit card->pixmapUpdated();
+    card->emitPixmapUpdated();
 }
 
 void PictureLoader::clearPixmapCache(CardInfo *card)