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Revert the following commit, it makes the freebsd doc chain fail.

From 8eb55d782a2b9afacc7938694891cc6fad7b42a5 Mon Sep 17 00:00:00 2001
From: Dennis Filder <d.filder@web.de>
Date: Fri, 13 Jun 2014 14:56:14 +0800
Subject: xmlSaveUri() incorrectly recomposes URIs with rootless paths

For https://bugzilla.gnome.org/show_bug.cgi?id=731063

xmlSaveUri() of libxml2 (snapshot 2014-05-31 and earlier) returns
bogus values when called with URIs that have rootless paths
(e.g. "urx:b:b" becomes "urx://b%3Ab" where "urx:b%3Ab" would be
correct)

--- uri.c.orig	2019-10-22 18:46:01 UTC
+++ uri.c
@@ -1201,6 +1201,8 @@ xmlSaveUri(xmlURIPtr uri) {
                 if (temp == NULL) goto mem_error;
                 ret = temp;
 	    }
+	    ret[len++] = '/';
+	    ret[len++] = '/';
 	}
 	if (uri->path != NULL) {
 	    p = uri->path;