revamp setup files

pyproject.toml

+[build-system]
+requires = ["oldest-supported-numpy",
+            "setuptools",
+            "distro",
+            "wheel"]
\ No newline at end of file

setup.cfg

@@ -7,10 +7,6 @@ verbose = 1
 
 [build_ext]
 
-[bdist_wheel]
-universal = 1
-
 [egg_info]
 tag_build =
 tag_date = 0
-

setup.py

@@ -201,7 +201,6 @@ opts = dict(
     url='http://spams-devel.gforge.inria.fr/',
     license='GPLv3',
     python_requires='>=3',
-    setup_requires=['Cython>=0.29', 'numpy>=1.12'],
     install_requires=['Cython>=0.29', 'numpy>=1.12',
                       'Pillow>=6.0', 'scipy>=1.0', 'six>=1.12'],
     packages=find_packages(),