[Rpm-maint] [rpm-software-management/rpm] Make the default DB backend macro configurable (#157)

[Panu Matilainen]

Commit e96fde8 doesn't quite cut it:

```
backend/dbi.c: In function ‘dbDetectBackend’:
backend/dbi.c:39:5: warning: not enough variable arguments to fit a sentinel [-Wformat=]
     char *db_backend = rpmExpand("%{?_db_backend}");
     ^~~~
```

Also I think software should honor configuration: if it's configured to use db X then it shouldn't override that through auto-detection. Maybe more like, autodetect if %_db_backend set to "auto" or undefined, otherwise do what the configuration says even if it means erroring out of the situation?

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