[rfa] Add bfd-in-memory io vector

[Andrew Cagney]

> Hello,
> 
> This adds a bfd-in-memory IO vector to BFD.  Note that it doesn't completly consolidate code using "struct bfd_in_memory" as some of it is pretty evil (grep for remaining references to BFD_IN_MEMORY).  I'll do another pass at eliminating more of the BFD_IN_MEMORY references in a follow-up patch.
> 
> I've tested this on i386 GNU/Linux with no regressions.  However, given my experience with the previous IOVEC change, I'm not sure how significant that result is :-/

Here's a revised patch.  An audit of remaining BFD_IN_MEMORY references 
turned up a likely bug in peicode.h.  This revision includes what I 
think is the necessary change.

The testing comment still applies though.

Ok?
Andrew

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