fix build on i386

https://github.com/scribusproject/scribus/issues/196

Index: scribus/pdfwriter.h
--- scribus/pdfwriter.h.orig
+++ scribus/pdfwriter.h
@@ -83,7 +83,7 @@ namespace Pdf
 	/**
 	 Cf. PDF32000-2008, 7.3.3
 	 */
-#if !defined(Q_OS_WIN) && (Q_PROCESSOR_WORDSIZE != 4)
+#if (!defined(Q_OS_WIN) && (Q_PROCESSOR_WORDSIZE != 4)) || defined(__OpenBSD__)
 	QByteArray toPdf(size_t v);
 #endif
 	
