Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

libnetfilter_cttimeout.spec

@@ -2,7 +2,6 @@ Name:           libnetfilter_cttimeout
 Version:        1.0.0
 Release:        12%{?dist}
 Summary:        Timeout policy tuning for Netfilter/conntrack
-Group:          System Environment/Libraries
 License:        GPLv2+
 URL:            http://netfilter.org
 Source0:        http://netfilter.org/projects/%{name}/files/%{name}-%{version}.tar.bz2
@@ -20,7 +19,6 @@ policy to the kernel.
 
 %package        devel
 Summary:        Timeout policy tuning for Netfilter/conntrack
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       libmnl-devel >= 1.0.0
 Requires:       kernel-headers