prelink 0.9.32-rc2 merged

[Carmelo AMOROSO]

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Folks,
I've merged master into prelink branch. As expected all elfinterp.c
files conflicted and were solved.
It required to post merge fixes to properly handle the new symbol_ref
struct with prelink stuff and protected symbols all together.

Tested on SH4, including prelink testsuite. No regressions.

There are some tidy-up that I've planned to do into the ld.so code, but
they are not so urgent and can be post release.

IMO after .32 stable will be out, we can work for a .33-rc series where
prelink can be merged.

Cheers,
Carmelo
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