selftests: net: ip_local_port_range.c:152:17: error: use of undeclared identifier 'IPPROTO_MPTCP'

I encountered the following build errors while compiling the selftests net test cases on Linux next-20240208 tag with clang toolchain.

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

selftests/net/ip_local_port_range ip_local_port_range.c:152:17: error: use of undeclared identifier 'IPPROTO_MPTCP' 152 | .so_protocol = IPPROTO_MPTCP, | ^ ip_local_port_range.c:176:17: error: use of undeclared identifier 'IPPROTO_MPTCP' 176 | .so_protocol = IPPROTO_MPTCP, | ^ 2 errors generated.

Build link, - https://storage.tuxsuite.com/public/linaro/lkft/builds/2c4LtUoRSYhdGbErOY8hq...

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