don't use the SPF RRTYPE

[bdijkstra82]

RFC 7208 deprecates the use of the SPF RRTYPE (99). Some DNS servers refuse to respond to any request with this type, libspf2 errors out in this case. This commit removes all use of ns_t_spf.

[kitterma]

The pr currently deletes config.h.in and has a massive difference in configure. Those seem extraneous and should be removed.

[bdijkstra82]

I wasn't sure what do to with these two files as they appear to be generated files. I deleted them to signal that they should be re-generated. If the pr will be rejected because of this, please let me know.

[eriklax]

While this change is good, debian (se below) did only one line. If use a custom build of 1.2.11 in production you must have this patched applied. Maybe this smaller patch may be merged for 1.2.12.

--- a/src/libspf2/spf_server.c 2012-01-28 09:24:47.000000000 +0100
+++ b/src/libspf2/spf_server.c 2014-06-19 14:09:07.000000000 +0200
@@ -346,7 +346,7 @@
 						spf_response, spf_recordp);

 	/* I am VERY, VERY sorry about the gotos. Shevek. */
-	rr_type = ns_t_spf;
+	rr_type = ns_t_txt;
 retry:
 	rr_txt = SPF_dns_lookup(resolver, domain, rr_type, TRUE);