Remove obsolete Group tag

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

gsm.spec

@@ -6,7 +6,6 @@ Version:        %{ver_maj}.%{ver_min}
 Release:        3%{?dist}
 Summary:        Shared libraries for GSM speech compressor
 
-Group:          System Environment/Libraries
 License:        MIT
 URL:            http://www.quut.com/gsm/
 Source:         http://www.quut.com/gsm/%{name}-%{version}.tar.gz
@@ -37,7 +36,6 @@ ETSI standard test patterns.
 
 %package        tools
 Summary:        GSM speech compressor tools
-Group:          Applications/Multimedia
 
 %description    tools
 Contains command line utilities for libgsm, an implementation of
@@ -47,7 +45,6 @@ excitation/long term prediction) coding at 13 kbit/s.
 
 %package        devel
 Summary:        Header files and development libraries for libgsm
-Group:          Development/Libraries
 Requires:       %{name}%{_isa} = %{version}-%{release}
 
 %description    devel