Remove obsolete Group tag

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

gsl.spec

@@ -7,7 +7,6 @@ URL: http://www.gnu.org/software/gsl/
 # eigen/nonsymmv.c and eigen/schur.c
 # contains rutiens which are part of LAPACK - under BSD style license
 License: GPLv3 and GFDL and BSD
-Group: System Environment/Libraries
 
 Source: ftp://ftp.gnu.org/gnu/gsl/%{name}-%{version}.tar.gz
 Patch0: gsl-1.10-lib64.patch
@@ -24,7 +23,6 @@ numerical analysis, written in C.
 
 %package devel
 Summary: Libraries and the header files for GSL development
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 Requires: pkgconfig, automake