Use a listen(2) backlog of 128.

There's a chance that incoming (legitimate) connections arrive faster
than what it takes to spawn a new thread and get back to
listen(). Therefore we should ask the stack to queue at least one
entry, i.e. use a backlog value of at least 1. There's arguable also a
chance of more than two concurrent incoming connections, which would
make a case for a backlog value greater than one.

A reasonable high value seems to be 128, which also is what SOMAXCONN
is on many unix systems. In the choice between 1 and 128, an argument
against the higher value is that it may mask the potential problem of
spending a long time serving incoming connections.

Being reasonably confident that radsecproxy is efficient when it comes
to serving incoming connections, by handing them off to a newly
spawned thread, I think that 128 is a fine choice.

Closes RADSECPROXY-72.

tcp.c

@@ -349,7 +349,7 @@ void *tcplistener(void *arg) {
     struct sockaddr_storage from;
     socklen_t fromlen = sizeof(from);
 
-    listen(*sp, 0);
+    listen(*sp, 128);
 
     for (;;) {
 	s = accept(*sp, (struct sockaddr *)&from, &fromlen);

tls.c

@@ -460,7 +460,7 @@ void *tlslistener(void *arg) {
     struct sockaddr_storage from;
     socklen_t fromlen = sizeof(from);
 
-    listen(*sp, 0);
+    listen(*sp, 128);
 
     for (;;) {
 	s = accept(*sp, (struct sockaddr *)&from, &fromlen);