contrib/rpm: enable ifcfg migration on Fedora 39+

https://fedoraproject.org/wiki/Changes/MigrateIfcfgToKeyfile

contrib/fedora/rpm/NetworkManager.spec

@@ -170,6 +170,12 @@
 %global ifcfg_warning 0
 %endif
 
+%if 0%{?fedora} >= 39
+%global ifcfg_migrate 1
+%else
+%global ifcfg_migrate 0
+%endif
+
 %if 0%{?fedora}
 # Although eBPF would be available on Fedora's kernel, it seems
 # we often get SELinux denials (rh#1651654). But even aside them,
@@ -743,6 +749,9 @@ Preferably use nmcli instead.
 	-Ddist_version=%{version}-%{release} \
 %if %{?config_plugins_default_ifcfg_rh}
 	-Dconfig_plugins_default=ifcfg-rh \
+%endif
+%if %{?ifcfg_migrate}
+	-Dconfig_migrate_ifcfg_rh_default=true \
 %endif
 	-Dresolvconf=no \
 	-Dnetconfig=no \
@@ -888,6 +897,9 @@ autoreconf --install --force
 	--with-dist-version=%{version}-%{release} \
 %if %{?config_plugins_default_ifcfg_rh}
 	--with-config-plugins-default=ifcfg-rh \
+%endif
+%if %{?ifcfg_migrate}
+	--with-config-migrate-ifcfg-rh-default=yes \
 %endif
 	--with-resolvconf=no \
 	--with-netconfig=no \