When calling ossl_crypto_condvar_wait_timeout() we must use real time

When calling ossl_crypto_condvar_wait_timeout() we must use real time

Although many of the QUIC tests use fake time, the time we pass to the
ossl_crypto_condvar_wait_timeout() must be a real time.

Passing fake time was causing the QUIC tserver test to hang because
ossl_crypto_convar_wait_timeout() always timed out immediately and never
relinquished the CPU.

If using fake time we adjust the time to real time just before using it.

Fixes #22020

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22301)