Kernel+LibC: Stub out SO_{SND_RCV}BUF

Author: https://github.com/alimpfard
Commit: 1e79c04616
Pull-request: https://github.com/SerenityOS/serenity/pull/5325
Issue: https://github.com/SerenityOS/serenity/issues/90
Reviewed-by: https://github.com/BenWiederhake
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/sunverwerth

Kernel/Net/LocalSocket.cpp

@@ -374,6 +374,10 @@ KResult LocalSocket::getsockopt(FileDescription& description, int level, int opt
         return EFAULT;
 
     switch (option) {
+    case SO_SNDBUF:
+        TODO();
+    case SO_RCVBUF:
+        TODO();
     case SO_PEERCRED: {
         if (size < sizeof(ucred))
             return EINVAL;