popen bug, extension

[Eric Blake]

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According to Corinna Vinschen on 8/19/2009 4:55 AM:
>>>     * libc/posix/Makefile.am (CHEWOUT_FILES): Document popen.
>>>     * libc/posix/posix.tex: New file.
> 
> For some reason it's not possible anymore to build libc.info with
> this change:
> 
> ./targetdep.tex:1415: `Posix' has no Up field (perhaps incorrect sectioning?).
> makeinfo: Removing output file `/home/corinna/src/cygwin/vanilla/newlib/libc/libc.info' due to errors; use --force to preserve.
> 
> I'm not sure where this is coming from.

Found it - I missed (at least one) file.  I'm now testing the following,
OK to commit if it fixes things?

2009-08-19  Eric Blake  <ebb9@byu.net>

	* libc/Makefile.am (SUBDEFS): Correctly build popen docs.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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