Avoid systemd_requires as per updated packaging guidelines

There is no need to have them as systemd correctly handles reloading
depending on the transaction ordering (even if systemd is installed
_after_ the package that installs the unit file).

avahi.spec

@@ -50,7 +50,7 @@
 
 Name:             avahi
 Version:          0.8
-Release:          16%{?dist}
+Release:          17%{?dist}
 Summary:          Local network service discovery
 License:          LGPLv2+
 URL:              http://avahi.org
@@ -116,7 +116,6 @@ BuildRequires:    mono-devel
 BuildRequires:    monodoc-devel
 %endif
 BuildRequires:    systemd
-%{?systemd_requires}
 BuildRequires:    gcc
 BuildRequires:    gcc-c++
 
@@ -830,6 +829,9 @@ exit 0
 
 
 %changelog
+* Fri Aug 05 2022 Kalev Lember <klember@redhat.com> - 0.8-17
+- Avoid systemd_requires as per updated packaging guidelines
+
 * Wed Jul 20 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.8-16
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild