[Rpm-maint] [rpm-software-management/rpm] --qyeryformat doesn't support '\0' (Issue #1876)

[Thomas Moschny]

RPM's man page states
> Query formats are modified versions of the standard printf(3) formatting. The format is made up of static strings (which may include standard C character escapes for newlines, tabs, and other special characters) [...]

However, `\0` doesn't seem to be supported, instead the character '0' is emitted:

```
$ rpm -q --queryformat '%{NAME}\0' rpm | xxd
00000000: 7270 6d30                                rpm0
```

Rationale: In some contexts it would be handy to use '\0' instead of '\n' as a delimiter in queries returning results for multiple packages.

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