Remove obsolete Group tag

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

yp-tools.spec

@@ -3,7 +3,6 @@ Name: yp-tools
 Version: 4.2.3
 Release: 3%{?dist}
 License: GPLv2
-Group: System Environment/Base
 Source: https://github.com/thkukuk/yp-tools/archive/v%{version}.tar.gz
 Patch1: yp-tools-2.12-hash.patch
 Patch2: yp-tools-2.12-crypt.patch
@@ -38,7 +37,6 @@ you'll need to install the ypserv package on one machine on the network.
 
 %package devel
 Summary: NIS (or YP) client programs
-Group: System Environment/Base
 Requires: yp-tools
 
 %description devel