rtld-elf - restore old tls/tcb code

rtld-elf - restore old tls/tcb code

 * This was ported incorrectly from FreBSD; the dtv in the TCB needs to
   be updated properly.

 * This fixes a fairly tricky issue that appears in threaded programs
   using dlopen() and family, such as php and Java. It presented itself
   as a strcmp segfault in object_match_name() due to a messed up STAILQ
   ->next pointer. The pointer was being messed up by the TLS code.

Reported-by: Peter Avalos, Antonio Huete, Francois Tigeot