RT3271: Don't use "if !" in shell lines

For portability don't use "if ! expr"

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
(cherry picked from commit b999f66e34d19ae4d81263bc96b8b8d548d2e13c)
RT3192: spurious error in DSA verify

This is funny; Ben commented in the source, Matt opend a ticket,
and Rich is doing the submit.  Need more code-review? :)

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
(cherry picked from commit eb63bce040d1cc6147d256f516b59552c018e29b)