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

[Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>]

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@xxxxxxxxxx>

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/2c4LtUoRSYhdGbErOY8hqHxc6Tu/

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Linaro LKFT
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