fix build epiphany-plugins on 64bit archs

[The Undefined <undefine aramin net>]

patch in attachment
-- 
Andrzej 'The Undefined' Dopierała
UNIX && Linux administrator, Adam Mickiewicz University WMiI
PLD Linux Developer             HomePage: http://aramin.net/
JID: undefine piastlan net    e-mail: undefine pld-linux org

--- epiphany-extensions-1.4.1/extensions/error-viewer/sgml-validator.c~	2004-09-26 16:22:39.000000000 +0000
+++ epiphany-extensions-1.4.1/extensions/error-viewer/sgml-validator.c	2004-10-09 01:06:47.957865904 +0000
@@ -271,8 +271,8 @@
 	char *encoding;
 	char *base;
 	char *buf;
-	int buf_size = 4096;
-	int len;
+	gsize buf_size = 4096;
+	gsize len;
 	GIOChannel *in;
 	GIOChannel *out;
 	GIOStatus status;