Patch to handle compressed sections

[Craig Silverstein]

} (I'd have used a four-byte magic, and an object-file-endianness
} 64-bit size; in particular the four-byte magic makes it easier to
} visually see the size in section dumps.)

Four-byte magic is a good point; I'll do that and call this version
ZLIB.  If we ever wanted to add more to the zlib header, I'd just make
a new version called ZLB2 or something, so no big deal.

Object-file-endianness makes sense as well.  Unless I run into
problems, I'll probably do things that way.

Thanks for your feedback!

craig