Remove obsolete Group tag

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

libdv.spec

@@ -3,7 +3,6 @@ Name:           libdv
 Version:        1.0.0
 Release:        28%{?dist}
 License:        LGPLv2+
-Group:          System Environment/Libraries
 URL:            http://libdv.sourceforge.net/
 Source:         http://downloads.sourceforge.net/libdv/libdv-%{version}.tar.gz
 Patch1:         libdv-0.104-no-exec-stack.patch
@@ -27,7 +26,6 @@ and SMPTE 314M.
 
 %package tools
 Summary:        Basic tools to manipulate Digital Video streams
-Group:          Applications/Multimedia
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description tools
@@ -39,7 +37,6 @@ digital camcorders, typically those that support the IEEE 1394
 
 %package devel
 Summary:        Development package for libdv
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       pkgconfig