Remove obsolete Group tag

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

libtiff.spec

@@ -3,7 +3,6 @@ Name:          libtiff
 Version:       4.0.10
 Release:       1%{?dist}
 License:       libtiff
-Group:         System Environment/Libraries
 URL:           http://www.simplesystems.org/libtiff/
 
 Source:        ftp://ftp.simplesystems.org/pub/libtiff/tiff-%{version}.tar.gz
@@ -26,7 +25,6 @@ format image files.
 
 %package devel
 Summary:       Development tools for programs which will use the libtiff library
-Group:         Development/Libraries
 Requires:      %{name}%{?_isa} = %{version}-%{release}
 Requires:      pkgconfig%{?_isa}
 
@@ -41,7 +39,6 @@ install the libtiff package.
 
 %package static
 Summary:     Static TIFF image format file library
-Group:       Development/Libraries
 Requires:    %{name}-devel%{?_isa} = %{version}-%{release}
 
 %description static
@@ -51,7 +48,6 @@ necessary for some boot packages.
 
 %package tools
 Summary:    Command-line utility programs for manipulating TIFF files
-Group:      Development/Libraries
 Requires:   %{name}%{?_isa} = %{version}-%{release}
 
 %description tools