Build failure on macOS for wireguard tools 0.0.20171001

[ilove zfs]

MNL_SOCKET_BUFFER_SIZE is not defined on macOS since libmnl.h is for Linux only but  0.0.20171001 still attempts to use it, leading to build failure



A full build log is here: https://gist.github.com/ilovezfs/ae19ee8af5b64bc1e89b453b2283b53f



The error is "ipc.c:891:45: error: use of undeclared identifier 'MNL_SOCKET_BUFFER_SIZE'"


Ref: https://github.com/Homebrew/homebrew-core/pull/18822




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