[git commit nptl] wordexp: silence shadow warning

[Carmelo AMOROSO]

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Bernhard Reutner-Fischer wrote:
> commit: http://git.uclibc.org/uClibc/commit/?id=f2e300431f5c56c0d2019a197ad1da24592ea842
> branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/nptl
> 
> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
> (cherry picked from commit 831ea78623556cbfae002477afc6256cacaaf2c6)
> 
> Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>

A set of cherry-picks from master to keep nptl in synch.
Build tested on sh4.

Carmelo
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