x86-64 prelink support for TLS dialect gnu2

[Steven Newbury]

I'm working on gettting TLS gnu2 dialect support working for x86-64
with prelink.  Yes, it's still maintained, see:
https://git.yoctoproject.org/cgit/cgit.cgi/prelink-cross/

I've written the attached patch which enables prelink to recognise
R_X86_64_TLSDESC relocations and do the same as is done currently for
ARM.  Unfortunately, while this seems to work, when a prelinked binary
is loaded with a shared library with such a relocation it fails with:

  "error while loading shared libraries: unexpected reloc type 0x24".

reloc type 0x24 is indeed R_X86_64_TLSDESC.

The strange thing is the code in glibc which generates this error
(sysdeps/x86_64/dl-machine.h) specifically handles R_X86_64_TLSDESC.
I can't understand how it is falling through to _dl_reloc_bad_type ()
with reloc 0x24 since in both instances the error case shouldn't be
reached!

Can anybody help?
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