Fix build failure when DNSSEC code omitted.

src/dnsmasq.h

@@ -1518,7 +1518,5 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
 			unsigned short udp_sz, int optno, unsigned char *opt, size_t optlen, int set_do);
 size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3);
 size_t add_source_addr(struct dns_header *header, size_t plen, char *limit, union mysockaddr *source);
-#ifdef HAVE_DNSSEC
 size_t add_do_bit(struct dns_header *header, size_t plen, char *limit);
-#endif
 int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer);

src/edns0.c

@@ -208,6 +208,11 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
   return p - (unsigned char *)header;
 }
 
+size_t add_do_bit(struct dns_header *header, size_t plen, char *limit)
+{
+  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, 0, NULL, 0, 1);
+}
+
 static int filter_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv)
 {
   struct macparm *parm = parmv;
@@ -329,13 +334,6 @@ size_t add_source_addr(struct dns_header *header, size_t plen, char *limit, unio
   return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_CLIENT_SUBNET, (unsigned char *)&opt, len, 0);
 }
 
-#ifdef HAVE_DNSSEC
-size_t add_do_bit(struct dns_header *header, size_t plen, char *limit)
-{
-  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, 0, NULL, 0, 1);
-}
-#endif
-
 int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer)
 {
   /* Section 9.2, Check that subnet option in reply matches. */