There is no reason to hide FIPS functionality behind build flags.
OpenSSL always provide the information about FIPS availability via
`FIPS_mode()` function.

This makes the user experience more consistent, because the OpenSSL
library is always queried and the `crypto.getFips()` always returns
OpenSSL settings.

Fixes nodejs#34903

Signed-off-by: Jan Staněk <[email protected]>

- The fipsMode constant (defined at compile time)
  was replaced by the new `TestFipsCrypto()`/`testFipsCrypto()` functions,
  which rely on the OpenSSL function `FIPS_selftest()`.

  This results in the FIPS mode being always checked on runtime
  and being informed purely by the OpenSSL implementation in use.

When compiled `--without-ssl`,
the `--{enable,force}-fips` flags are not present.

Now they are tested only when Node id compiled `--with-ssl`.