error.  When checking like engine_add() is, those errors are actually
good, so remove them.

few small constifying changes, and why not throw in a couple of extras
while I'm at it?

needed now.

From: Lutz Jaenicke <Lutz.Jaenicke@aet.TU-Cottbus.DE>

load the "external" built-in engines (those that require DSO).  This
makes linking with libdl or other dso libraries non-mandatory.

Change 'openssl engine' accordingly.

Change the engine header files so some declarations (that differed at
that!) aren't duplicated, and make sure engine_int.h includes
engine.h.  That way, there should be no way of missing the needed
info.

At the same time, add VMS support for Rijndael.