Remove obsolete Group tag

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

liblockfile.spec

@@ -3,7 +3,6 @@ Version:        1.14
 Release:        2%{?dist}
 Summary:        This implements a number of functions found in -lmail on SysV systems
 
-Group:          Applications/System
 # regarding license please see file COPYRIGHT
 License:        GPLv2+ and LGPLv2+
 URL:            http://packages.qa.debian.org/libl/liblockfile.html
@@ -21,7 +20,6 @@ manage and remove generic lockfiles.
 
 %package devel
 Summary: Development files for %{name}
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 
 %description devel