apps/ocsp.c Use the same HAVE_FORK / NO_FORK as in speed.c
apps/ocsp.c Use the same HAVE_FORK / NO_FORK as in speed.c

This allows the user to override our defaults if needed, and in a
consistent manner.

Partial fix for #7607

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7624)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl