selftests: net: ip_local_port_range: define IPPROTO_MPTCP

Older glibc's netinet/in.h may leave IPPROTO_MPTCP undefined when
building ip_local_port_range.c, that leads to "error: use of undeclared
identifier 'IPPROTO_MPTCP'".

Define IPPROTO_MPTCP in such cases, just like in other MPTCP selftests.

Fixes: 122db5e3634b ("selftests/net: add MPTCP coverage for IP_LOCAL_PORT_RANGE")
Reported-by: Linux Kernel Functional Testing <[e-mail]>
Closes: https://lore.kernel.org/netdev/[e-mail]/
Signed-off-by: Maxim Galaganov <[e-mail]>
Tested-by: Linux Kernel Functional Testing <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/ip_local_port_range.c

···
 #define IP_LOCAL_PORT_RANGE 51
 #endif
 
+#ifndef IPPROTO_MPTCP
+#define IPPROTO_MPTCP 262
+#endif
+
 static __u32 pack_port_range(__u16 lo, __u16 hi)
 {
 	return (hi << 16) | (lo << 0);