xapian: Reimplement document-bytes.

The current implementation of document-bytes involves converting the
document data string into a list of characters, mapping over the
result with char->integer and passing the list of integers to
u8-list->integer. This is quite an expensive operation (relative to
what the user might expect), and may not reliably return a result if
the document data couldn't be decoded as a UTF-8 string in the first
place.

Now that we have SWIG wrappers that return bytevectors directly, we
can redefine document-bytes as an alias of Document-get-data-bytes.

* xapian/xapian.scm (document-bytes): Redefine function in terms of
Document-get-data-bytes.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

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