[Rpm-maint] [rpm-software-management/rpm] RFE: Syntax sugar for bconds with inherited defaults (#941)

[Miro Hrončok]

I often find myself writing code like this:

```
%bcond_with some_thing

%if %{with some_thing}
%bcond_with some_other_thing
%else
%bcond_without some_other_thing
%endif
```

Or the other way around:

```
%bcond_with some_thing

%if %{with some_thing}
%bcond_without some_other_thing
%else
%bcond_with some_other_thing
%endif
```

This allows to do reasonable defaults based on other defaults:

 - if boostrapping, disable tests and documentation build
 - if compatibility package, disallow the devel subpackage

While preserving the ability to customize the bahavior using `--with`/ `--without`:

- disable tests even when not bootstrapping
- build the compatibility package with the devel subpackage

I'd like to have some kind of syntax sugar for this, such as for example:

```
%bcond_with some_thing
%bcond_inherit some_other_thing some_thing
# or
%bcond_antiinherit some_other_thing some_thing
```

Or:

```
%bcond_with some_thing
%bcond_some_thing_inherit some_other_thing
# or
%bcond_some_thing_antiinherit some_other_thing
```
Would that be desirable? I can work on a PR if we agree on the syntax.

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