Fix many memory leaks in algorithm test utilities.

Fix memory leaks by uninstantiating DRBG before reinitialising it.

EC_NISTP_64_GCC_128 by default, as GCC isn't currently supported on
VMS.  Synchronise with Unix.

Submitted by: Emilia Kasper

InvMixColumns).

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>
Reviewed by: steve

Send alert instead of assertion failure for incorrectly formatted DTLS
fragments.

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>
Reviewed by: steve

Fix for ECC keys and DTLS.

Submitted by: emmanuel.azencot@bull.net
Reviewed by: steve

Return -1 immediately if not affine coordinates as BN_CTX has not been
set up.

around sub-shell limitation.

even to code segments.