Remove obsolete Group tag

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

libsndfile.spec

@@ -3,7 +3,6 @@ Name:		libsndfile
 Version:	1.0.28
 Release:	9%{?dist}
 License:	LGPLv2+ and GPLv2+ and BSD
-Group:		System Environment/Libraries
 URL:		http://www.mega-nerd.com/libsndfile/
 Source0:	http://www.mega-nerd.com/libsndfile/files/libsndfile-%{version}.tar.gz
 Patch0:		libsndfile-1.0.25-system-gsm.patch
@@ -36,7 +35,6 @@ compiles and runs on *nix, MacOS, and Win32.
 
 %package devel
 Summary:	Development files for libsndfile
-Group:		Development/Libraries
 Requires:	%{name}%{?_isa} = %{version}-%{release} pkgconfig
 
 
@@ -48,7 +46,6 @@ This package contains files needed to develop with libsndfile.
 
 %package utils
 Summary:	Command Line Utilities for libsndfile
-Group:		Applications/Multimedia
 Requires:	%{name} = %{version}-%{release}