Build getaddr/nameinfo into lib/.

Split code to generate "rwx-----" strings into lib/permstring.c so it
can be reused in tls.

platforms that don't have them.

--copy-links.  The readlink_stat() does need to be done in the normal case
before checking the exclude patterns because it needs to know whether or
not a file is a directory in order to properly handle a trailing slash
in an exclude pattern.  This fix makes make_file() go ahead and call
readlink_stat() but then if the latter returns an ENOENT and copy_links is
on then it will only print an error if the path is not excluded.

opening an inbound socket, we might get several address results,
e.g. for the machine's ipv4 and ipv6 name.

If binding a wildcard, then any one of them should do.  If an address
was specified but it's insufficiently specific then that's not our
fault.

However, some of the advertized addresses may not work because e.g. we
don't have IPv6 support in the kernel.  In that case go on and try all
addresses until one succeeds.

many globals already.

Better error messages for network-related failures.

because on Solaris (for one) it's not in libc.

seems no point using anything but the platform's native definition,
and if we can't get that from the system headers we're hosed anyhow.

how this is supposed to help.

Check for netdb.h

be conditional -- they are missing on e.g. Solaris.  Not sure if this
will fix it.

Show IPv6 availability in --version.

or literal IP addresses to rsync, and if your platform supports them
they will be used.  Also there are -4 and -6 command-line options to
choose the default address type.  Thankyou!

readlink_stat() on an excluded file can be a problem when using the
--copy-links option (also known as -L) and the excluded file is a symlink
that points nowhere.