crypto: enable FIPS only when configured with it

[indutny]

Do not rely on OPENSSL_FIPS in node_crypto.cc when building with
shared FIPS-enabled OpenSSL library. Enable FIPS in core only when
configured with --openssl-fips.

Fix: #3077

cc @nodejs/crypto

[bnoordhuis]

LGTM

[indutny]

Thanks, @bnoordhuis. I'm going to skip CI run, because we are not testing FIPS mode anyway.

[indutny]

Landed in 9bd26e7

[rvagg]

I'm going to skip CI run, because we are not testing FIPS mode anyway.

@indutny don't discount weird side-effects that you can't predict, like Windows oddities with .gyp files or compiler differences. CI runs are cheap and for this kind of thing you could just look at a few test runs and verify that builds have happened successfully elsewhere to have confidence so you don't even need to wait for the whole thing if you're impatient.

[indutny]

@rvagg ok, I will do it next time if you insist. I just always try to spare the CI, and save some time for other people :)