[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 :-/

Anyway, Ok?
Andrew
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