Remove obsolete Group tag

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

netresolve.spec

@@ -4,7 +4,6 @@ Name: netresolve
 Version: 0.0.1
 Release: 0.22%{?snapshot_suffix}%{?dist}
 Summary: Generic name resolution library
-Group: System Environment/Libraries
 License: BSD
 # https://github.com/crossdistro/netresolve , possibly?
 URL: https://sourceware.org/%{name}/
@@ -42,14 +41,12 @@ glibc as well as a testbed for future glibc improvements.
 
 %package core
 Summary: Core netresolve libraries
-Group: Development/Libraries
 %description core
 This package provides core netresolve library with basic name resolution
 capabilities for tools and application.
 
 %package compat
 Summary: Compatibility netresolve libraries and tools
-Group: Development/Libraries
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 %description compat
 This package provides libraries and tools for using netresolve from applications
@@ -57,7 +54,6 @@ built against other name resolution libraries.
 
 %package tools
 Summary: Command line tools based on core netresolve libraries
-Group: Development/Libraries
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 %description tools
 This package provides tools that provide netresolve capabilities using the
@@ -66,14 +62,12 @@ command line.
 %package backends-compat
 Summary: Backends for netresolve using existing tools
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
-Group: Development/Libraries
 %description backends-compat
 This package provides backends for querying libc, glibc nsswitch backends,
 asyncns and other existing name resolution libraries.
 
 %package backends-aresdns
 Summary: DNS backend for netresolve based on aresdns
-Group: Development/Libraries
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 %description backends-aresdns
 This package provides DNS capabilities including learning DNSSEC validity
@@ -81,7 +75,6 @@ from the AD flag for netresolve using c-ares.
 
 %package backends-avahi
 Summary: Multicast DNS backend for netresolve based on libavahi
-Group: Development/Libraries
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 %description backends-avahi
 This package provides Multicast DNS capabilities using Avahi daemon and
@@ -90,7 +83,6 @@ libraries.
 %if 0%{?fedora}
 %package backends-ubdns
 Summary: DNS backend for netresolve based on libunbound
-Group: Development/Libraries
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 %description backends-ubdns
 This package provides DNS capabilities including DNSSEC validation to
@@ -99,7 +91,6 @@ netresolve using libunbound.
 
 %package devel
 Summary: Development files for netresolve
-Group: Development/Libraries
 Requires: %{name}%{?_isa} = %{version}-%{release}
 %description devel
 This package contains header files and libraries needed to compile