Remove obsolete Group tag

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

libart_lgpl.spec

@@ -7,7 +7,6 @@ Source0: http://download.gnome.org/sources/libart_lgpl/2.3/%{name}-%{version}.ta
 #Fedora specific patch
 Patch0: libart-multilib.patch
 License: LGPLv2+
-Group: System Environment/Libraries 
 BuildRequires: automake autoconf
 BuildRequires: pkgconfig
 BuildRequires: libtool
@@ -18,7 +17,6 @@ applications. libart renders vector paths and the like.
 
 %package devel
 Summary: Libraries and headers for libart_lgpl
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 
 %description devel