update the handling of CONNECT: it has no response body by default, but

update the handling of CONNECT: it has no response body by default, but

	* libsoup/soup-message.c (soup_message_get_response_encoding):
	update the handling of CONNECT: it has no response body by
	default, but does have a body if its headers say so.

	* tests/proxy-test.c: test libsoup's behavior when talking to
	proxies.

	* tests/httpd.conf.in: Load mod_proxy and mod_ssl, and add
	sections configuring them, for proxy-test

	* configure.in: update the apache-module-dir-finding code to deal
	with the fact that some modules (eg, mod_ssl) might only be in the
	mpm-specific module dir, while others (eg, mod_php5) might only be
	in the generic module dir.

svn path=/trunk/; revision=920