binutils-20000625 ld.exe --shared broken

[DJ Delorie]

> I agree with DJ, although I must confess I had to read the explanation
> and look through the code a couple of times before understanding what
> is going on.

I wish I had understood it after just a *couple* of reads.  It took me
a lot longer than that to figure out why pe-dll was having such a hard
time of it, until Ian clued me in that BFD_IN_MEMORY was an old hack
and unlikely to still work right.

I'll work up a comment for that part of the code, though.