Proper detection whether SCTP is available. Do not update player names on configuration change if network client is running.

src/net/linux/socket_startup.cpp

@@ -22,6 +22,10 @@
 
 #include <net/socket_startup.h>
 
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
 bool
 socket_startup()
 {
@@ -33,3 +37,18 @@ socket_cleanup()
 {
 }
 
+bool
+socket_has_sctp()
+{
+#ifdef IPPROTO_SCTP
+	int test = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
+
+	if (test == -1)
+		return false;
+	close(test);
+	return true;
+#else
+	return false;
+#endif
+}
+