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more ELF changes

Hi,

I've checked in another bunch of ELF changes.  With these changes we
should now follow the upcoming ELF specification.  Again, the new
functionality is not yet tested as te linker cannot emit it yet.  But
it doesn't break existing programs.

I had to change the RTLD_START code.  This means that port maintainer
for architectures != ix86 have something to do.  The change are
trivial and I probably could very well do it myself but I'll leave it
to you.  The changes are that before calling the initializers one by
one there must be a similar loop before this which calls the
pre-initializers.  The function pointers can be found by calling
_dl_preinit_next.  Very simple.

-- 
---------------.      drepper at gnu.org  ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Cygnus Solutions `--' drepper at cygnus.com   `------------------------
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