odb/source-loose: move loose source into "odb/" subsystem
In subsequent patches we'll be turning `struct odb_source_loose` into a
proper `struct odb_source`. As a first step towards this goal, move its
struct out of "object-file.c" and into "odb/source-loose.c".
This detaches the implementation of the loose object source from the
generic object file code, following the same convention already used by
the "files" and "in-memory" sources.
No functional changes are intended.
Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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