Remove obsolete Group tag

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

SDL_sound.spec

@@ -2,7 +2,6 @@ Name:           SDL_sound
 Version:        1.0.3
 Release:        22%{?dist}
 Summary:        Library handling decoding of several popular sound file formats
-Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://www.icculus.org/SDL_sound
 # This is:
@@ -31,7 +30,6 @@ and behind-the-scenes, if the programmer desires.
 
 %package        devel
 Summary:        %{summary}
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 Requires:       SDL-devel