Re: [PATCH 0/1] MR3403: server: Revert "server: Avoid using SOL_IPX to detect whether IPX is supported."

[Jinoh Kang (＠iamahuman)]

Commit 41cc117b3f37ab4b9b4ac8a815cd2a496d38fb4b is from MR !2965, which fixes building with bionic libc:
> 4.18+ Linux kernels remove support for IPX but keep SOL_IPX defined, which causes compilation errors as wine unconditionally uses IPX structures if this is the case. Instead check for IPX_MTU to determine IPX support as it is defined within the ipx.h header itself.

Maybe the check can be made stricter in a way that allows both musl and bionic. Alternatively, we can just test for `struct sockaddr_ipx` in autoconf.