Remove obsolete Group tag

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

libsrtp.spec

@@ -4,7 +4,6 @@ Name:		libsrtp
 Version:	1.5.4
 Release:	9%{?dist}
 Summary:	An implementation of the Secure Real-time Transport Protocol (SRTP)
-Group:		System Environment/Libraries
 License:	BSD
 URL:		https://github.com/cisco/libsrtp
 Source0:	https://github.com/cisco/libsrtp/archive/v%{version}.tar.gz
@@ -24,7 +23,6 @@ a supporting cryptographic kernel.
 
 %package devel
 Summary:	Development files for %{name}
-Group:		Development/Libraries
 Requires:	%{name}%{?_isa} = %{version}-%{release}
 Requires:	pkgconfig