Revert "TEST: make and use a fipsinstall script"

Revert "TEST: make and use a fipsinstall script"

Unfortunately, this won't work on MacOS because of system integrity
measures on that platform, which clears DYLD_LIBRARY_PATH before
starting a sub-process executable.

Ref: https://developer.apple.com/library/archive/documentation/Security/Conceptual/System_Integrity_Protection_Guide/RuntimeProtections/RuntimeProtections.html

This reverts commit ae6b654b669638882a6ddce012ff55adc7cf6a82.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11592)