test: never run fipsinstall if the tests are not enabled.

test: never run fipsinstall if the tests are not enabled.

Fixes #15056

The dependency for fipsinstall was being added to the makefile regardless of
it being used.  This means that a subsequent `make test` would fail if the
command line application wasn't present.  Rather than fix the instance in question,
it is better to leave out this part of the makefile if the tests cannot be
run.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15057)