Update to latest package guidelines

libssh.spec

@@ -4,8 +4,6 @@ Release:        1%{?dist}
 Summary:        A library implementing the SSH protocol
 License:        LGPLv2+
 URL:            http://www.libssh.org
-Group:          System Environment/Libraries
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 Source0:        https://red.libssh.org/attachments/download/195/libssh-0.7.3.tar.xz
 
@@ -27,7 +25,6 @@ third-party programs others than libcrypto (from openssl).
 
 %package devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       pkgconfig
 Requires:       cmake