openssl/crypto/dso

TODO
----

Find a way where name-translation can be done in a way that is
sensitive to particular methods (ie. generic code could still do
different path/filename substitutions on win32 to what it does on
*nix) but doesn't assume some canonical form. Already one case
exists where the "blah -> (libblah.so,blah.dll)" mapping doesn't
suffice. I suspect a callback with an enumerated (or string?)
parameter could be the way to go here ... DSO_ctrl the callback
into place and it can be invoked to handle name translation with
some clue to the calling code as to what kind of system it is.

NOTES
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I've checked out HPUX (well, version 11 at least) and shl_t is
a pointer type so it's safe to use in the way it has been in
dso_dl.c. On the other hand, HPUX11 support dlfcn too and
according to their man page, prefer developers to move to that.
I'll leave Richard's changes there as I guess dso_dl is needed
for HPUX10.20.