Remove obsolete Group tag

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

audiofile.spec

@@ -7,7 +7,6 @@ Release: 21%{?dist}
 Epoch: 1
 # library is LGPL / the two programs GPL / see README
 License: LGPLv2+ and GPLv2+
-Group: System Environment/Libraries
 Source: http://audiofile.68k.org/%{name}-%{version}.tar.gz
 URL: http://audiofile.68k.org/
 BuildRequires:  gcc-c++
@@ -40,7 +39,6 @@ any of the sound file formats it can handle.
 
 %package devel
 Summary: Development files for Audio File applications
-Group: Development/Libraries
 Requires: %{name}%{?_isa} = %{epoch}:%{version}-%{release}
 
 %description devel