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helper: wl-socket: fix build for musl

Danh Doan requested to merge sgn/kwin:fix-musl-build into master

bind(2) expects its second parameters is a "const struct sockaddr*", let's cast the "struct sockaddr_un*" to "struct sockaddr*" before passing into bind(2).

SUN_LEN is a BSD extension that also implemented by GNU, let's define _GNU_SOURCE before including "sys/un.h".

Need to be back-ported to 5.21

There is also another fix for musl, namely: add _GNU_SOURCE to 3rdparty/xcursor.c, but I'm not the author of that patch https://github.com/void-linux/void-packages/blob/master/srcpkgs/kwin/patches/musl.patch

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