Remove obsolete Group tag

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

orc.spec

@@ -3,7 +3,6 @@ Version:	0.4.28
 Release:	3%{?dist}
 Summary:	The Oil Run-time Compiler
 
-Group:		System Environment/Libraries
 License:	BSD
 URL:		http://cgit.freedesktop.org/gstreamer/orc/
 Source0:	http://gstreamer.freedesktop.org/src/orc/%{name}-%{version}.tar.xz
@@ -19,7 +18,6 @@ subtraction, and many arithmetic operations.
 
 %package doc
 Summary:	Documentation for Orc
-Group:		Development/Languages
 Requires:	%{name} = %{version}-%{release}
 BuildArch:	noarch
 
@@ -28,7 +26,6 @@ Documentation for Orc.
 
 %package devel
 Summary:	Development files and libraries for Orc
-Group:		Development/Libraries
 Requires:	%{name} = %{version}-%{release}
 Requires:	%{name}-compiler
 Requires:	pkgconfig
@@ -39,7 +36,6 @@ on orc.
 
 %package compiler
 Summary:	Orc compiler
-Group:		Development/Libraries
 Requires:	%{name} = %{version}-%{release}
 Requires:	pkgconfig