Potential spiped 1.6.1 release -- please test

[Colin Percival <cperciva@tarsnap.com>]

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Hi spiped users,

I've just uploaded a tarball which may be (modulo version number update)
spiped 1.6.1.  Please test this -- even if all you have time to do is check
that it compiles on your platform, that's better than nothing, but running
'make all test' and/or testing with live usage would be much better.

You can download the spiped code at
  https://www.tarsnap.com/spiped/spiped-1.6.1a.tgz
and the tarball has SHA256 hash
  11690b81e68d8aa1997a17fd5fe6b692fcb9d1d2a2eba4bc7b3d78b5e32546b7
.  You can also see the tree from which I rolled this almost-release at
https://github.com/Tarsnap/spiped if you find it useful to crawl through
VCS history.

Significant changes since 1.6.0:
* A new -u option instructs spiped to run as a different uid/gid.
* RDRAND x86 CPU extensions (if available) are used as an additional source
of entropy.  (Note that they are only used as a *supplemental* source, and
if the operating system provides strong entropy then it doesn't matter if
RDRAND works.)
* SHA x86 CPU extensions (if available) are used to speed up computations.
Few CPUs support these yet.
* spipe now prints a warning if it cannot connect to the target host.

There are also a variety of less visible changes: Minor bug and compiler
warning fixes, added and improved tests, minor performance improvements, and
spelling and stylistic fixes.

Assuming nobody finds any problems (or the problems are things I can fix
quickly and easily) I'll roll the official spiped 1.6.1 release in early
January.  As always, Tarsnap bug bounties apply to issues found in spiped.

Colin Percival
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