sleep.c: Limit the sleep time instead of sleeping for days or even years

sleep.c: Limit the sleep time instead of sleeping for days or even years

As the sleep() call is interruptible, it is not even a good idea to call
it in a loop if the caller uses some ridiculously large value as an
infinity just waiting for an interrupt.

Fixes #20524

Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/20533)