[core] use IPPROTO_TCP instead of SOL_TCP for TCP_FASTOPEN (#3071)

Change-Id: I2b3b4a62c434c3a8b972d2e6bd09730e004514d0

src/angel/angel_plugin_core.c

@@ -628,7 +628,7 @@ static int do_listen(liServer *srv, liSocketAddress *addr, GString *str) {
 		}
 #ifdef TCP_FASTOPEN
 		v = 1000;
-		setsockopt(s, SOL_TCP, TCP_FASTOPEN, &v, sizeof(v));
+		setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN, &v, sizeof(v));
 #endif
 		if (-1 == listen(s, 1000)) {
 			close(s);
@@ -668,7 +668,7 @@ static int do_listen(liServer *srv, liSocketAddress *addr, GString *str) {
 		}
 #ifdef TCP_FASTOPEN
 		v = 1000;
-		setsockopt(s, SOL_TCP, TCP_FASTOPEN, &v, sizeof(v));
+		setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN, &v, sizeof(v));
 #endif
 		if (-1 == listen(s, 1000)) {
 			close(s);

src/main/angel_fake.c

@@ -76,7 +76,7 @@ int li_angel_fake_listen(liServer *srv, GString *str) {
 		}
 #ifdef TCP_FASTOPEN
 		v = 1000;
-		setsockopt(s, SOL_TCP, TCP_FASTOPEN, &v, sizeof(v));
+		setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN, &v, sizeof(v));
 #endif
 		if (-1 == listen(s, 1000)) {
 			ERROR(srv, "Couldn't listen on '%s': %s", tmpstr->str, g_strerror(errno));