[PATCH] ld.so __libc_memalign cleanup

[Florian Weimer]

I did not understand what was going on in terms of exported symbols when 
I removed the use of __libc_memalign from ld.so.  Andreas explained to 
me that the libc malloc is interposed into the dynamic linker (for later 
use during dlopen), and that's the reason why the symbols are public in 
ld.so.

Now that we no longer use __libc_memalign, we do not need to interpose 
it, so the attached patch removes it from ld.so.

Tested on s390x, ppc64le, x86_64, i386, s390, ppc, aarch64.  (Final 
version with the elf/Versions change only tested on x86_64, ppc, aarch64.)

Thanks,
Florian
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