Temporarily disable RAND call in FIPS_MODE until RAND is available

Other commits will enable the RAND code in FIPS_MODE. Until those commits
are in place we temporarily disable making RAND calls while in FIPS_MODE.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9130)