Remove multicast.c from build

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

src/Makefile.am

@@ -10,7 +10,7 @@ RIGSRC = hamlibdatetime.h rig.c serial.c serial.h misc.c misc.h register.c regis
    	network.c network.h cm108.c cm108.h gpio.c gpio.h idx_builtin.h token.h \
    	par_nt.h microham.c microham.h amplifier.c amp_reg.c amp_conf.c \
    	amp_conf.h amp_settings.c extamp.c sleep.c sleep.h sprintflst.c \
-   	sprintflst.h cache.c cache.h snapshot_data.c snapshot_data.h multicast.c fifo.c fifo.h \
+   	sprintflst.h cache.c cache.h snapshot_data.c snapshot_data.h fifo.c fifo.h \
     serial_cfg_params.h
 
 if VERSIONDLL

src/iofunc.c

@@ -1417,8 +1417,8 @@ static int read_string_generic(hamlib_port_t *p,
             if (errno == EAGAIN)
             {
                 hl_usleep(5 * 1000);
-                rig_debug(RIG_DEBUG_WARN, "%s: port_read is busy? direct=%d\n", __func__,
-                          direct);
+//                rig_debug(RIG_DEBUG_WARN, "%s: port_read is busy? direct=%d\n", __func__,
+//                          direct);
             }
         }
 

tests/rigtestmcast.c

@@ -31,10 +31,13 @@ int main(int argc, char *argv[])
 #endif
     rig->state.rigport.parm.serial.rate = 38400;
     rig_open(rig);
+    // disabled until we change this to the other multicast capability
+#if 0
     multicast_init(rig, "224.0.0.1", 4532);
     printf("threadid=%lld\n", (long long)rig->state.multicast->threadid);
     pthread_join(rig->state.multicast->threadid, NULL);
     pthread_exit(NULL);
+#endif
     return 0;
 }
 #endif