RT#4284
Reviewed-by: NRich Salz <rsalz@openssl.org>

and engage it in most modules.
Reviewed-by: NTim Hudson <tjh@openssl.org>

As some of ARM processors, more specifically Cortex-Mx series, are
Thumb2-only, we need to support Thumb2-only builds even in assembly.
Reviewed-by: NTim Hudson <tjh@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NEmilia Käsper <emilia@openssl.org>