add an orig_http_version field.

add an orig_http_version field.

	* libsoup/soup-message-private.h (SoupMessagePrivate): add
	an orig_http_version field.

	* libsoup/soup-message.c (soup_message_init): initialize
	orig_http_version.
	(soup_message_set_http_version): If called before the status code
	is received, set orig_http_version too.
	(soup_message_cleanup_response): Restore orig_http_version, so
	that we don't send an HTTP/1.0 request in response to an HTTP/1.0
	redirect. #521848, Tommi Komulainen.

	* libsoup/soup-message-server-io.c (get_response_headers):
	actually output "HTTP/1.0", not "HTTP/1.1", if the message's http
	version is 1.0.

	* tests/redirect-test.c (server_callback): Add a regression test;
	set http_version to 1.0 when returning a redirect, but require it
	to be 1.1 when processing the following request

svn path=/trunk/; revision=1108