Remove the various gethostbyname_r checks and just check for

Remove the various gethostbyname_r checks and just check for

	* configure.in: Remove the various gethostbyname_r checks and just
	check for getnameinfo/getaddrinfo.

	* libsoup/soup-dns.c: de-nastify. Make this use threads instead of
	forking. Change the API around a bunch in the process.

	* libsoup/soup-address.c: Update for soup-dns changes

	* tests/dns.c: take multiple hostnames on the command line and
	resolve them all at once (patch from tml)