[Rpm-maint] [rpm-software-management/rpm] `%{sub:...}` macro does not work with `%{expand:...}` (Issue #3412)

[Vít Ondruch]

The subject is likely wrong, because I don't understand the mechanism. But for some reason, it does not seem that the value provided by `%{expand:...}` is properly used by `%{sub:...}`

**Expected behavior**

~~~
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval '%{sub %{expand:%{%{quote:?}%{gsub %{name} - _}_prerelease}} 2 -1}'
dev
~~~

**Output**

~~~
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval '%{sub %{expand:%{%{quote:?}%{gsub %{name} - _}_prerelease}} 2 -1}'
{?string_io_prerelease}
~~~

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