Define `SOL_IP` and `SOL_TCP`; ref
MODIFY
mrbgems/mruby-socket/src/const.cstub
mrbgems/mruby-socket/src/const.cstub
#if defined(SOL_SOCKET)
define_const(SOL_SOCKET);
#endif
+#if defined(SOL_IP)
+ define_const(SOL_IP);
+#endif
+#if defined(SOL_TCP)
+ define_const(SOL_TCP);
+#endif
#if defined(TCP_CONGCTL)
define_const(TCP_CONGCTL);
#endif

MODIFY
mrbgems/mruby-socket/src/const.def
mrbgems/mruby-socket/src/const.def
@@ -143,6 +143,8 @@ SOCK_SEQPACKET
SOCK_STREAM
SOL_SOCKET
+SOL_IP
+SOL_TCP
TCP_CONGCTL
TCP_CONGESTION

Define `SOL_IP` and `SOL_TCP`; ref #3999