More warnings.
bignum: fix boundary condition in montgomery logic

It's not clear whether this inconsistency could lead to an actual
computation error, but it involved a BIGNUM being passed around the
montgomery logic in an inconsistent state. This was found using flags
-DBN_DEBUG -DBN_DEBUG_RAND, and working backwards from this assertion
in 'ectest';

ectest: bn_mul.c:960: BN_mul: Assertion `(_bnum2->top == 0) ||
(_bnum2->d[_bnum2->top - 1] != 0)' failed

Signed-off-by: Geoff Thorpe <geoff@openssl.org>
Fixed spelling error in error message. Fix supplied by Marcos Marado
typo in SSL_get_peer_cert_chain docs

RT: 3304
dso: eliminate VMS code on non-VMS systems

Even though the meat of dso_vms.c is compiled out on non-VMS builds,
the (pre-)compiler still traverses some of the macro handling. This
trips up at least one non-VMS build configuration, so this commit
makes the skip-VMS case more robust.

Signed-off-by: Geoff Thorpe <geoff@openssl.org>