Don't use %__install

> Macro forms of system executables SHOULD NOT be used except when there
> is a need to allow the location of those executables to be configurable.
> For example, rm should be used in preference to %{__rm}, but
> %{__python3} is acceptable.
-- https://docs.fedoraproject.org/en-US/packaging-guidelines/#_macros

python-mutagen.spec

@@ -66,7 +66,7 @@ sphinx-build -b html -n docs docs/_build
 %install
 %py3_install
 
-%{__install} -D -p -m 0644 man/*.1 %{buildroot}%{_mandir}/man1
+install -D -p -m 0644 man/*.1 %{buildroot}%{_mandir}/man1
 
 # Remove hidden files
 rm -rf docs/_build/{.buildinfo,.doctrees}