Remove obsolete Group tag

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

ilbc.spec

@@ -3,7 +3,6 @@ Summary:	Internet Low Bitrate Codec
 Version:	1.1.1
 Release:	14%{?dist}
 License:	BSD
-Group:		Development/Libraries
 # wget --content-disposition https://github.com/dekkers/libilbc/tarball/88cd161
 Source0:	dekkers-libilbc-upstream-1.1.1-9-g88cd161.tar.gz
 # Fedora/EPEL-specific
@@ -29,7 +28,6 @@ delayed IP packets.
 
 %package	devel
 Summary:	development files for %{name}
-Group:		Development/Libraries
 Requires:	%{name}%{?_isa} = %{version}-%{release}
 Requires:	pkgconfig