Remove obsolete Group tag

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

libtirpc.spec

@@ -4,7 +4,6 @@ Name:			libtirpc
 Version:		1.1.4
 Release:		2.rc2%{?dist}
 Summary:		Transport Independent RPC Library
-Group:		  	System Environment/Libraries
 License:		SISSL and BSD
 URL:  			http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary
 Source0:		http://downloads.sourceforge.net/libtirpc/libtirpc-%{version}.tar.bz2
@@ -28,7 +27,6 @@ by almost 70 vendors on all major operating systems.  TS-RPC source code
 
 %package devel
 Summary:		Development files for the libtirpc library
-Group:			Development/Libraries
 Requires:		%{name}%{?_isa} = %{version}-%{release}
 Requires:		pkgconfig man-db