Particular use case: I'd like to be able to query a spec file for the list of
its patches. Currently (on Fedora 39's 4.19.1) this is only possible using
`rpmspec --shell` but it requires parsing the output:
```
❯ echo '%patches' | rpmspec --shell ./*.spec
RPM version 4.19.1.1 macro shell
> %patches
'/home/michel/src/fedora/pkgs/other/slurm/slurm_release_version.patch'
'/home/michel/src/fedora/pkgs/other/slurm/slurm_check_version.patch'
'/home/michel/src/fedora/pkgs/other/slurm/slurm_html_doc_path.patch'
'/home/michel/src/fedora/pkgs/other/slurm/slurm_perlapi_rpaths.patch'
'/home/michel/src/fedora/pkgs/other/slurm/slurm_runtime_linking.patch'
'/home/michel/src/fedora/pkgs/other/slurm/slurm_to_python3.patch'
> ⏎
```
without shell, `rpmspec` only allows querying query tags e.g.
```
$ rpmspec --srpm --query --qf '%{name}\n' ./*.spec
slurm
$ rpmspec --srpm --query --qf '%{patches}\n' ./*.spec
error: incorrect format: unknown tag: "patches"
```
While `rpm` allows evaluating anything but only those define by shipped macros,
not definitions that are spec file specific; `rpmspec` does seem to have a `-E`
eval option but it is undocumented and does not seem to work
```
$ rpm -E '%_sysconfdir'
/etc
$ rpmspec -q -E '%patches' ./*.spec
error: lua script failed: attempt to index a nil value
```
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