unexelf.c maybe broke between 21.1 and 21.2

[Tom Horsley]

The unexelf.c in emacs-21.2 fails to build a functional object file on my
system. The resulting emacs always coredumps because none of its globals
actually have correctly initialized values in them.

When I copy the old emacs-21.1/src/unexelf.c file into my 21.2 directory and
rebuild, the resulting emacs seems to work perfectly.

Unfortunately, when I compare the old and new code, I see no obvious reason
for it to act any differently, perhaps it is just an accident that one works
and the other doesn't because the size of the executable changes with
different code and things come out aligned better, but I thought I should
report it anyway in case other folks have elf dumping problems, perhaps we
can figure out why someday (but there is no way I have enough time to debug
it now, especially since I came up with the workaround of uisng the old code
:-).
--
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