TEST: add util/wrap.pl and use it

util/wrap.pl is a script that defines the environment variables
OPENSSL_ENGINES and OPENSSL_MODULES, then calls the command line
that's given as its arguments.

On a POSIX platform, the command line call is done via
util/shlib_wrap.sh to ensure that the shared library paths are
correct.  For other platforms, util/wrap.pl currently assumes that
similar things are already in place through other means.

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/11110)