Remove obsolete Group tag

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

libglade2.spec

@@ -3,7 +3,6 @@ Name: libglade2
 Version: 2.6.4
 Release: 19%{?dist}
 License: LGPLv2+
-Group: System Environment/Libraries
 Source: http://download.gnome.org/sources/libglade/2.6/libglade-%{version}.tar.bz2
 URL: http://www.gnome.org
 Requires: xml-common
@@ -33,7 +32,6 @@ initial interface loading time, there is no performance tradeoff.
 
 %package devel
 Summary: The files needed for libglade application development
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 
 %description devel