[Rpm-maint] [rpm-software-management/rpm] Add support for reading BDB without the library (#980)

[Michael Schroeder]

This commit implements a slow read-only backend that allows
accessing of BerkeleyDB databases without using the BerkeleyDB
library. The code supports btree version 9 and hash version 8
and 9.

There are two use cases for this:

1) Conversion of an existing BerkeleyDB to a different
   backend.

2) Allowing package scriptlets to do database queries while
   in a transaction that replaced rpm with a version that
   no longer links against BerkeleyDB.

Currently prefix searching is not supported (but it would be
easy to add).
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/980

-- Commit Summary --

  * Add support for reading BDB without the library

-- File Changes --

    M configure.ac (14)
    M lib/Makefile.am (4)
    A lib/backend/bdb_ro.c (736)
    M lib/backend/dbi.c (3)
    M lib/backend/dbi.h (5)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/980.patch
https://github.com/rpm-software-management/rpm/pull/980.diff

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