PT_GNU_RELRO support

[Ulrich Drepper]

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I've checked in the necessary support code.  It's so far only tested on
x86 since I had some problems with ld on other archs.  This shouldn't
cause any problems, though, the protection is simply not performed.
Anyway, no need to do anything if the code fails on x86-64 or ia64, I'll
get to testing it in the next day or two.

- -- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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