[Toybox] [PATCH] ifconfig FTBFS here-needs sys/un.h

[Isaac Dunham]

Hello,
I did make allyesconfig; make (to test ifconfig) and get this:

Compile toybox...
toys/pending/ifconfig.c: In function 'is_host_unix':
toys/pending/ifconfig.c:121: error: invalid application of 'sizeof' to incomplete type 'struct sockaddr_un' 
toys/pending/ifconfig.c:124: error: dereferencing pointer to incomplete type
toys/pending/ifconfig.c:124: error: dereferencing pointer to incomplete type
toys/pending/ifconfig.c: In function 'address_to_name':
toys/pending/ifconfig.c:273: error: dereferencing pointer to incomplete type
toys/pending/ifconfig.c:273: error: dereferencing pointer to incomplete type

This struct is specified by POSIX to be in <sys/un.h>, so here's the fix.
Compile tested on glibc and musl (though musl also misses IPPROTO_TCP in nbd_client.c)

-- 
Isaac Dunham <idunham at lavabit.com>
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