make avahi and nss-mdns recommended in main package - so users with older printers

can install cups without it

cups.spec

@@ -15,7 +15,7 @@ Summary: CUPS printing system
 Name: cups
 Epoch: 1
 Version: 2.3.1
-Release: 6%{?dist}
+Release: 7%{?dist}
 License: ASL 2.0 with exceptions for GPL2/LGPL2
 Url: http://www.cups.org/
 Source0: https://github.com/apple/cups/releases/download/v%{VERSION}/cups-%{VERSION}-source.tar.gz
@@ -152,7 +152,10 @@ Requires: acl
 Requires: cups-filters
 
 # getaddrinfo from glibc needs nss-mdns for resolving mdns .local addresses
-Requires: nss-mdns
+# it is needed only for new devices (2012+), so make it only recommended for
+# users with older devices
+Recommends: nss-mdns
+Recommends: avahi
 
 %package client
 Summary: CUPS printing system - client programs
@@ -713,6 +716,10 @@ rm -f %{cups_serverbin}/backend/smb
 %{_mandir}/man7/ippevepcl.7.gz
 
 %changelog
+* Mon Apr 06 2020 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.3.1-7
+- make avahi and nss-mdns recommended in main package - so users with older printers
+  can install cups without it
+
 * Fri Mar 20 2020 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.3.1-6
 - add requires on nss-mdns, because getaddrinfo needs it for resolving .local addresses