Remove md5-utils.h include since it's not part of Camel any more.

Remove md5-utils.h include since it's not part of Camel any more.

	* camel.h: Remove md5-utils.h include since it's not part of Camel
	any more.

	* camel-charset-map.c: Kill some warnings.

	* providers/nntp/camel-nntp-grouplist.c
	(camel_nntp_get_grouplist_from_file, camel_nntp_grouplist_save):
	Clean up warnings about time_t casts.

	* providers/smtp/camel-smtp-transport.c: Remove unused md5-utils.h
	include.

	* providers/pop3/camel-pop3-store.c: Undefine the "_" macro
	defined by krb4's des.h when compiling with krb support.
	Fix md5-utils.h include.