[PATCH] Fix linker script ld.so adding AS_NEEDED entry for the dynamic linker

[Carmelo AMOROSO]

Hi All,
while compiling uClibc++ against uClibc-nptl, I found a problem
into the linker script libc.so.
The uClibc++ needs the __tls_get_addr symbol (TLS enabled), but it 
cannot find
it because the dynamic linker is not present into the linker script libc.so.
In the same way, a lot of applications using TLS dynamic access model 
will fail
linking with uclibc-nptl

This patch solves this issues defining into Rules.mak the ASNEEDED variables
only for the NPTL case.

It could be worth to add it both into trunk and nptl branch

Regards,
Carmelo
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