Remove obsolete Group tag

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

liboggz.spec

@@ -3,7 +3,6 @@ Version:        1.1.1
 Release:        15%{?dist}
 Summary:        Simple programming interface for Ogg files and streams
 
-Group:          System Environment/Libraries
 License:        BSD
 URL:            http://www.xiph.org/oggz/
 Source0:        http://downloads.xiph.org/releases/liboggz/%{name}-%{version}.tar.gz
@@ -23,7 +22,6 @@ format.
 
 %package devel
 Summary:	Files needed for development using liboggz
-Group:          Development/Libraries
 Requires:       liboggz = %{version}-%{release}
 Requires:       libogg-devel >= 1.0
 Requires:       pkgconfig
@@ -39,7 +37,6 @@ development using liboggz.
 
 %package doc
 Summary:        Documentation for liboggz
-Group:		Documentation
 Requires:	liboggz = %{version}-%{release}
 
 %description doc