Several feature defines need to be set before including system headers,
otherwise build breaks:
> /usr/include/X11/Xtrans/Xtranssock.c: In function '_XSERVTransSocketRead':
> /usr/include/X11/Xtrans/Xtranssock.c:2161:14: error: 'struct msghdr' has no member named 'msg_control'
> 2161 | .msg_control = cmsgbuf.buf,
> | ^~~~~~~~~~~
> /usr/include/X11/Xtrans/Xtranssock.c:2162:14: error: 'struct msghdr' has no member named 'msg_controllen'
> 2162 | .msg_controllen = CMSG_LEN(MAX_FDS * sizeof(int))
> | ^~~~~~~~~~~~~~
>
> ../os/access.c:339:14: error: implicit declaration of function 'asprintf'; did you mean 'Xasprintf'? [-Werror=implicit-function-declaration]
> 339 | length = asprintf(addr, "%s%c%s", type, delimiter, value);
> | ^~~~~~~~
> | Xasprintf
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
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