Remove obsolete Group tag

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

libint2.spec

@@ -16,7 +16,6 @@ Name:		libint2
 Version:	2.1.0
 Release:	8%{?dist}
 Summary:	A library for efficient evaluation of electron repulsion integrals
-Group:		System Environment/Libraries
 License:	GPLv2+
 URL:		https://github.com/evaleev/libint
 
@@ -55,7 +54,6 @@ super-scalar architectures.
 
 %package doc
 Summary:	Documentation for libint
-Group:		Development/Libraries
 Requires:	libint2 = %{version}-%{release}
 %if 0%{?rhel} != 5
 BuildArch:	noarch
@@ -67,7 +65,6 @@ for the classes.
 
 %package devel
 Summary:	Development headers and libraries for libint
-Group:		Development/Libraries
 Requires:	libint2%{?_isa} = %{version}-%{release}
 
 %description devel