Extend check for python_module to also support prefixed_python_module

[marcosbc]

Relates #321

We are using a variant of python_module which we have named prefixed_python_module, given that we have the need of including a custom prefix in all our Python packages. The related contribution to python-rpm-macros can be found here.

However, upon executing spec-cleaner on a recipe with a conditional BuildRequires which uses this macro, it will suggest a breaking change. For instance:

-BuildRequires:  %{prefixed_python_module tomli = 2.0.2 if %python-base < 3.11}
+BuildRequires:  %{prefixed_python_module tomli = 2.0.2 if %{python}-base < 3.11}

This has already been resolved for python_module via #322, and we would like to propose for spec-cleaner also support this new prefixed_python_module macro that we are using.