Remove obsolete Group tag

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

cppad.spec

@@ -27,7 +27,6 @@ Summary: C++ Algorithmic Differentiation (AD), %{name}-devel and %{name}-doc
 # change (see mention of cppad_lib below).
 %global debug_package %{nil}
 
-Group: Development/Libraries 
 License: GPLv3
 URL: http://www.coin-or.org/CppAD/
 Source: http://www.coin-or.org/download/source/CppAD/%{name}-%{version}.gpl.tgz
@@ -41,7 +40,6 @@ C++ Algorithmic Differentiation (AD), see %{name}-devel, %{name}-doc.
 # ---------------------------------------------------------------------------
 %package devel
 Summary: The %{name} C++ include files for Algorithmic Differentiation (AD)
-Group: Development/Libraries
 Provides: %{name} = %{version}-%{release}
 # Requested by bug report
 #     https://bugzilla.redhat.com/show_bug.cgi?id=1197488
@@ -61,7 +59,6 @@ See the package %{name}-doc for documentation of this version of %{name}.
 # ----------------------------------------------------------------------------
 %package doc
 Summary: Documentation for %{name}-devel
-Group: Documentation
 BuildArch: noarch
 
 %description doc