RFC: ghc's dynamic linker

[Alastair Reid]

> Thanks, I didn't know about libelf.  That might be a good replacement
> for our custom linker (at least on ELF platforms) at some point.

Note that it's _not_ a linker - just a good clean set of struct
definitions, some code to read and write them to a file and a few
utility functions.  It seems to use mmap and friends to read the file
so it's quite efficient.  (But you have to turn this off at configure
time if you're _both_ reading and writing the file because mmap doesn't
work very well over NFS.)

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A