ldns: fix the build in FreeBSD's base system

This adds an ldns/internal.h C header, containing a copy of the
function prototypes for internal functions not exposed in the API.

It effectively works around the following compilation error:
error: no previous prototype for function [-Werror,-Wmissing-prototypes]

This header is not installed, and does not affect the API exposed.

Tested on FreeBSD/amd64 (14.0-CURRENT).

contrib/ldns/dnssec_zone.c

@@ -5,6 +5,7 @@
 #include <ldns/config.h>
 
 #include <ldns/ldns.h>
+#include <ldns/internal.h>
 
 ldns_dnssec_rrs *
 ldns_dnssec_rrs_new(void)

contrib/ldns/edns.c

@@ -11,6 +11,7 @@
  */
 
 #include <ldns/ldns.h>
+#include <ldns/internal.h>
 
 #define LDNS_OPTIONLIST_INIT 8
 

contrib/ldns/ldns/internal.h

@@ -0,0 +1,65 @@
+#ifndef LDNS_INTERNAL_H
+#define LDNS_INTERNAL_H
+
+#include <ldns/dnssec_sign.h>
+#include <ldns/util.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* dnssec_zone.c */
+ldns_status
+dnssec_zone_equip_zonemd(ldns_dnssec_zone *zone,
+		ldns_rr_list *new_rrs, ldns_key_list *key_list, int signflags);
+
+/* edns.c */
+void
+ldns_edns_set_code(ldns_edns_option *edns, ldns_edns_option_code code);
+void
+ldns_edns_set_data(ldns_edns_option *edns, void *data);
+void
+ldns_edns_set_size(ldns_edns_option *edns, size_t size);
+
+/* net.c */
+int
+ldns_tcp_bgsend2(ldns_buffer *qbin,
+		const struct sockaddr_storage *to, socklen_t tolen, 
+		struct timeval timeout);
+int
+ldns_tcp_connect2(const struct sockaddr_storage *to, socklen_t tolen, 
+		struct timeval timeout);
+int
+ldns_udp_bgsend2(ldns_buffer *qbin,
+		const struct sockaddr_storage *to  , socklen_t tolen, 
+		struct timeval timeout);
+int
+ldns_udp_connect2(const struct sockaddr_storage *to, struct timeval ATTR_UNUSED(timeout));
+
+/* packet.c */
+ldns_edns_option_list*
+pkt_edns_data2edns_option_list(const ldns_rdf *edns_data);
+
+/* rr.c */
+ldns_status
+_ldns_rr_new_frm_fp_l_internal(ldns_rr **newrr, FILE *fp,
+		uint32_t *default_ttl, ldns_rdf **origin, ldns_rdf **prev,
+		int *line_nr, bool *explicit_ttl);
+
+/* str2host.c */
+ldns_status svcparam_key2buffer_str(ldns_buffer *output, uint16_t key);
+
+/* util.c */
+struct tm *
+ldns_serial_arithmetics_gmtime_r(int32_t time, time_t now, struct tm *result);
+#undef ldns_serial_arithmitics_gmtime_r
+struct tm *
+ldns_serial_arithmitics_gmtime_r(int32_t time, time_t now, struct tm *result);
+#define ldns_serial_arithmitics_gmtime_r ldns_serial_arithmetics_gmtime_r
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LDNS_INTERNAL_H */

contrib/ldns/packet.c

@@ -13,6 +13,7 @@
 #include <ldns/config.h>
 
 #include <ldns/ldns.h>
+#include <ldns/internal.h>
 
 #include <strings.h>
 #include <limits.h>

contrib/ldns/rr.c

@@ -10,6 +10,7 @@
 #include <ldns/config.h>
 
 #include <ldns/ldns.h>
+#include <ldns/internal.h>
 
 #include <strings.h>
 #include <limits.h>

contrib/ldns/str2host.c

@@ -13,6 +13,7 @@
 #include <ldns/config.h>
 
 #include <ldns/ldns.h>
+#include <ldns/internal.h>
 
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>

contrib/ldns/util.c

@@ -15,6 +15,7 @@
 #include <ldns/rdata.h>
 #include <ldns/rr.h>
 #include <ldns/util.h>
+#include <ldns/internal.h>
 #include <strings.h>
 #include <stdlib.h>
 #include <stdio.h>