build: drop TS_CLASS definition, used nowhere

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

configure.ac

@@ -346,8 +346,6 @@ case "$host_os" in
 	*solaris*)
 		AC_DEFINE_UNQUOTED([COROSYNC_SOLARIS], [1],
 				   [Compiling for Solaris platform])
-		AC_DEFINE_UNQUOTED([TS_CLASS], [1],
-				   [Prevent being scheduled RR])
 	;;
 esac