[PATCH 0/1] MR2965: {server, ws2_32, ntdll}: Avoid using SOL_IPX to detect whether IPX is supported

[Billy Laws (＠bylaws)]

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.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2965