Remove %clean section

None of currently supported distributions need that.
Last one was EL5 which is EOL for a while.

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

cyrus-sasl.spec

@@ -355,9 +355,6 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/*.la
 rm -f $RPM_BUILD_ROOT%{_mandir}/cat8/saslauthd.8
 
 
-%clean
-test "$RPM_BUILD_ROOT" != "/" && rm -rf $RPM_BUILD_ROOT
-
 %pre
 getent group %{username} >/dev/null || groupadd -g 76 -r %{username}
 getent passwd %{username} >/dev/null || useradd -r -g %{username} -d %{homedir} -s /sbin/nologin -c "%{hint}" %{username}