BuildRequire setuptools explicitly, not just transitively

They were pulled in by sphinx -> babel -> setuptools, but are no more.

    + /usr/bin/python3 setup.py build '--executable=/usr/bin/python3 -sP'
    Traceback (most recent call last):
      File "/builddir/build/BUILD/wrapt-1.14.1/setup.py", line 4, in <module>
        import setuptools
    ModuleNotFoundError: No module named 'setuptools'

python-wrapt.spec

@@ -19,6 +19,7 @@ Source0:        https://github.com/GrahamDumpleton/%{sname}/archive/%{version}.t
 BuildRequires:  gcc
 
 BuildRequires:  python3-devel
+BuildRequires:  python3-setuptools
 
 %global _description\
 The aim of the wrapt module is to provide a transparent object proxy\