rpm: switch deps to python3-setuptools on CentOS too

Since qubesagent module is py3 completely, switch dependency on CentOS
too.

Fixes QubesOS/qubes-issues#5290

rpm_spec/core-agent.spec.in

@@ -138,11 +138,7 @@ Requires:   qubes-core-qrexec-vm
 Requires:   qubes-libvchan
 Requires:   qubes-db-vm
 Requires:   python%{python3_pkgversion}-dnf-plugins-qubes-hooks
-%if 0%{?rhel} == 7
-Requires: python-setuptools
-%else
 Requires: python%{python3_pkgversion}-setuptools
-%endif
 Obsoletes:  qubes-core-vm-kernel-placeholder <= 1.0
 Obsoletes:  qubes-upgrade-vm < 3.2
 Provides:   qubes-core-vm = %{version}-%{release}
@@ -157,11 +153,7 @@ BuildRequires: libX11-devel
 BuildRequires: qubes-utils-devel >= 3.1.3
 BuildRequires: qubes-libvchan-@BACKEND_VMM@-devel
 BuildRequires: pam-devel
-%if 0%{?rhel} == 7
-BuildRequires: python-setuptools
-%else
 BuildRequires: python%{python3_pkgversion}-setuptools
-%endif
 BuildRequires: systemd
 Source0: %{name}-%{version}.tar.gz