Fix multicast test compile

https://github.com/Hamlib/Hamlib/issues/695

include/hamlib/rig.h

@@ -45,6 +45,7 @@
 
 /* Rig list is in a separate file so as not to mess up w/ this one */
 #include <hamlib/riglist.h>
+#include <hamlib/config.h>
 
 /**
  * \addtogroup rig
@@ -2479,6 +2480,8 @@ struct multicast_s
 #ifdef HAVE_ARPA_INET_H
     struct ip_mreq mreq; // = {0};
     struct sockaddr_in dest_addr; // = {0};
+#else
+#warning NO ARPA_INET
 #endif
 };
 

src/multicast.c

@@ -246,6 +246,8 @@ int multicast_init(RIG *rig, char *addr, int port)
     }
     else if (rig->state.multicast->multicast_running) { return RIG_OK; } // we only need one port
 
+    //rig->state.multicast->mreq = {0};
+
     if (addr == NULL) { addr = RIG_MULTICAST_ADDR; }
 
     if (port == 0) { port = RIG_MULTICAST_PORT; }

src/multicast.h

@@ -24,8 +24,11 @@ struct multicast_s
     int runflag; // = 0;
     pthread_t threadid;
 #ifdef HAVE_ARPA_INET_H
+#warn HAVE_ARPA_INET
     struct ip_mreq mreq; // = {0};
     struct sockaddr_in dest_addr; // = {0};
+#else
+#warn DO NOT HAVE ARPA_INET_H
 #endif
 };
 #endif