[Rpm-maint] [rpm-software-management/rpm] Add LMDB backend for RPMDB to RPM (from @n3npq in #281) (#291)

[Jeff Johnson]

The last patch to RPM_CHECK_LIB is appropriate for "opt-out" builds (i.e. --without-lmdb).

Leave "no" if willing to explicitly "opt-in" by passing --with-lmdb to configure.

For a serious test in CI, arrange for the macro %_db_backend lmdb to be set by default. Almost certainly you will also find that the lock.mdb file will need 0666 permissions when creating/using a database as non-root. The existing implementation will propagate that permission through --rebuilddb if set once when a database is created.

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