selftests/rseq: Fix warnings about #if checks of undefined tokens

commit d7ed99ad upstream.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-12-mathieu.desnoyers@efficios.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>