Fix fipsinstall module path

Fix fipsinstall module path

If a path is specified with the -module option it will use this path to load the library when the provider is activated,
instead of also having to set the environment variable OPENSSL_MODULES.

Added a platform specific opt_path_end() function that uses existing functionality used by opt_progname().

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/12761)