(cherry picked from commit b69437e1)

(cherry picked from commit 4df2280b)

(and pending AVX2 changes).
(cherry picked from commit 504bbcf3)

(cherry picked from commit 988d11b6)

Note that it initially applies to 1.0.2, and not to HEAD. This is
in order to allow development with existing libunbound installations
that are dependent on OpenSSL 1.0.x. More details in RT.

RT: 3003

Reencode certificates in X509_sign_ctx as well as X509_sign.

This was causing a problem in the x509 application when it modified an
existing certificate.
(cherry picked from commit c6d8adb8)

While ARMv7 in general is capable of unaligned access, not all instructions
actually are. And trouble is that compiler doesn't seem to differentiate
those capable and incapable of unaligned access. Side effect is that kernel
goes into endless loop retrying same instruction triggering unaligned trap.
Problem was observed in xts128.c and ccm128.c modules. It's possible to
resolve it by using (volatile u32*) casts, but letting STRICT_ALIGNMENT
be feels more appropriate.
(cherry picked from commit 3bdd8052)