Configure DEPs for FIPS provider on AIX.

Configure DEPs for FIPS provider on AIX.

The binder of the AIX linker needs to be told which functions to call on
loading and initializing a shared object. Therefore another configuration
variable shared_fipsflag is introduced, which is appended to shared_defflag
when the providers/fips module gets configured.

It was suggested to refactor the line in the build file template to become
more generic and less magic. There is, however, currently no suggestion how
to actually achive this, so we leave a TODO comment.
The possible shared_fipsflag must only be appended to the shared_def iff
this code is acting on behalf of the fips provider module build.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11950)