check for gmtime_r

check for gmtime_r

	* configure.in: check for gmtime_r

	* libsoup/soup-date.c: date/time-manipulation functions

	* libsoup/soup-xmlrpc-message.c:
	* libsoup/soup-xmlrpc-response.c: XMLRPC message classes, from
	Mariano Suarez-Alvarez, Fernando Herrera, and Jeff Bailey.
	[#300227]

	* tests/date.c: soup-date test code

	* tests/getbug.c: XMLRPC test code. (Should be switched to use
	bugzilla.gnome.org once bgo supports XMLRPC.)

	* TODO: XMLRPC is implemented now (but shares the problem with
	SOAP that the API is not very good).