[PATCH-NPTL] environ heeds to be a weak_alias

[Carmelo Amoroso]

Hi Steve,
this patch to fix a problem into nptl branch related to strong_alias
used for data. Any code linked with the uCLibc-nptl trying to dereference
the 'environ' variable will segfault.
This has been already solved in trunk, and there are a lot of posts
into libc-alpha related to the wrong usage of strong_alias with data.

I caught a SIGSEV using busybox (env and awk applets). With this patch
it works fine.

Thanks and regards,
Carmelo
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