qt5: remove m_fontInfoIterator from Document

it was used by the deprecated scanForFonts API, which was not provided
in poppler-qt5
diff --git a/qt5/src/poppler-private.cc b/qt5/src/poppler-private.cc
index 1e47c6d..5ca4360 100644
--- a/qt5/src/poppler-private.cc
+++ b/qt5/src/poppler-private.cc
@@ -228,7 +228,6 @@
         qDeleteAll(m_embeddedFiles);
         delete (OptContentModel *)m_optContentModel;
         delete doc;
-        delete m_fontInfoIterator;
     
         count --;
         if ( count == 0 )
@@ -240,7 +239,6 @@
     
     void DocumentData::init()
     {
-        m_fontInfoIterator = 0;
         m_backend = Document::SplashBackend;
         paperColor = Qt::white;
         m_hints = 0;
diff --git a/qt5/src/poppler-private.h b/qt5/src/poppler-private.h
index 6eb9612..18f0a69 100644
--- a/qt5/src/poppler-private.h
+++ b/qt5/src/poppler-private.h
@@ -125,7 +125,6 @@
 	
 	void fillMembers()
 	{
-		m_fontInfoIterator = new FontIterator(0, this);
 		int numEmb = doc->getCatalog()->numEmbeddedFiles();
 		if (!(0 == numEmb)) {
 			// we have some embedded documents, build the list
@@ -142,7 +141,6 @@
 	QString m_filePath;
 	QByteArray fileContents;
 	bool locked;
-	FontIterator *m_fontInfoIterator;
 	Document::RenderBackend m_backend;
 	QList<EmbeddedFile*> m_embeddedFiles;
 	QPointer<OptContentModel> m_optContentModel;