[PATCH] build: avoid unneeded spawn-pipe gnulib module

[Pádraig Brady]

I noticed this uclibc build issue mentioned at:
http://permalink.gmane.org/gmane.comp.lib.uclibc.buildroot/73294

I sent a separate patch to gnulib to fix the direct issue there,
however I was surprised that we were using the spawn-pipe module at all.

It seems since coreutils 8.16 we've pulled in these dependencies:

  pipe
    spawn-pipe
      posix_spawnp
        posix_spawnp-internal
          spawn

The change to add "pipe" was triggered by this GNULIB_POSIXCHECK result:
 "call to 'pipe' declared with attribute warning: pipe is unportable -
  use gnulib module pipe-posix for portability [-Werror]"

So I think we really only need to include pipe-posix instead,
which is what the attached patch does.

The build error is a bit surprising as it suggests that uclibc builds
are broken since 8.16? Or maybe uclibc has recently moved posix_spawn() -lrt?
In any case these two fixes should avoid the issue for future coreutils 
releases.

thanks,
Pádraig.

pipe-posix.patch
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