PATCH: Fix TLS build

[Wolfram Gloger]

Hi,

> When your binutils supports TLS, but you don't enable LDT, you
> will get
> 
> td_thr_tls_get_addr.c: In function `td_thr_tls_get_addr':
> td_thr_tls_get_addr.c:46: structure has no member named `l_tls_modid'

I can confirm that this problem exists, and H.J.'s patch lets libc
build successfully.

Regards,
Wolfram.