It turns out that /DSF didn't do any good for our purposes.  Instead,
remove the CALL_DEBUG flag from any image we link.  This ensures that
we can have debugging information in the image files, but don't
automatically end up in a debugging session upon image activation.

Unfortunately, this means the CALL_DEBUG must be turned on when there
is a need to run with the debugger activated, and to turn it off when
done.  This has been documented in NOTES.VMS.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2957)

[.util]shareable_image_wrap.c.in was never useful because lib$spawn()
insisted on combining stdout and stderr into one.

Instead, we introduce two scripts that create and destroy a temporary
environment where the local shareable images become available,
[.util]local_shlib.com and [.util]unlocal_shlib.com.  They also define
DBG$IMAGE_DSF_PATH, which is require so the debugger can find the Debug
Symbol Files.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2947)