actually use TLS

[Ulrich Drepper]

I've checked in some changes which make glibc use TLS internally.  So
far only for errno but the list of variables will grow.  Not all works
right now (static programs, threaded programs) but you couldn't test it
yourself anyway unless you have some very hacked up version of binutils.

So, just ignore it.

The only visible change should be the changes to a few functions in
sysdeps/unix/sysv/linux where I removed the errno restoration code.  I
don't think it's necessary and it does cost something to have it.

-- 
---------------.                          ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Red Hat          `--' drepper at redhat.com   `------------------------
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