Re: s6-networking vs libressl static link

[Laurent Bercot]

 Meh. It looks like libressl uses pthreads *unconditionally*, so I added
-lpthread to its linker command line unconditionally as well.
Apparently I didn't build-test in a libressl+glibc configuration, sorry
about that.

 Please test with the latest s6-networking git head, and tell me if it
works for you.

--
 Laurent