[PATCH-NPTL] TLS symbol handling in _dl_find_hash

[Carmelo AMOROSO]

Hi Steve, All
I had a look into _dl_find_hash changes to handle TLS symbol.
Both CodeSourcery's and Steve's implementation are defining a new 
_dl_find_hash function suitable
to handle TLS symbols.
I'd like to submit to your attention my own implementation. I simply 
uses an I/O parameter referring to the
TLS module which resolves the target TLS symbol.
Only few changes are required in calling functions to meet the new 
interface (that is guarded by USE_TLS).
Note that the patch is against uClinc-nptl branch at April, 28th. For 
you convenience I attached both the patch
and the source file.

Rgds,
Carmelo

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