Building: Build Unix static libraries one object file at a time

Building: Build Unix static libraries one object file at a time

We're hitting problems that the 'ar' command line becomes too long for
some 'make' versions, or the shell it uses.

We therefore change the way we create a static library by doing so one
object file at a time.  This is slower, but has better guarantees to
work properly on limited systems.

Fixes #12116

Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/12706)