setup.cfg: Mark setuptools as required
setup.cfg: Mark setuptools as required

It's required, lets just document it as such.

mesonbuild/meson,becm/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,pexip/meson,mesonbuild/meson,pexip/meson,becm/meson,pexip/meson,becm/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,QuLogic/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,becm/meson,mesonbuild/meson,pexip/meson,becm/meson,jpakkane/meson,becm/meson,pexip/meson,jpakkane/meson,jpakkane/meson,pexip/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,becm/meson,becm/meson,jpakkane/meson,QuLogic/meson,becm/meson,becm/meson