Update precompiled pdfium for mac to chromium/3071 and add version info file with minimal build instructions

custom_widgets/yacreader_field_edit.h

@@ -0,0 +1,23 @@
+#ifndef YACREADER_FIELD_EDIT_H
+#define YACREADER_FIELD_EDIT_H
+
+#include <QLineEdit>
+
+class QAction;
+class QFocusEvent;
+
+class YACReaderFieldEdit : public QLineEdit
+{
+  Q_OBJECT
+	public:
+		YACReaderFieldEdit(QWidget * parent = 0);
+		void clear();
+		void setDisabled(bool disabled);
+	protected:
+		void focusInEvent(QFocusEvent* e);
+private:
+	QAction * restore;
+
+};
+
+#endif // YACREADER_FIELD_EDIT_H