disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/net/rxrpc/Makefile
..
..
@@ -25,6 +25,7 @@
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 	peer_event.o \
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 	peer_object.o \
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 	recvmsg.o \
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+	rtt.o \
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 	security.o \
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 	sendmsg.o \
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 	skbuff.o \