Remove #error if OPENSSL_NO_FOO is defined

discussed with jsing

Expand the SM4_ROUNDS macro.

This macro references variable names that are in the consuming function and
are not actually passed to the macro. Expanding it makes the logic clearer.
If we wanted to r

Expand the SM4_ROUNDS macro.

This macro references variable names that are in the consuming function and
are not actually passed to the macro. Expanding it makes the logic clearer.
If we wanted to reduce code the middle six group of rounds could be
implemented using a for loop (which the compiler can then choose to
unroll).

ok tb@

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Replace {load,store}_u32_be() with crypto_{load,store}_be32toh().

load_u32_be() and store_u32_be() are not symmetrical, with load_u32_be()
having a rather unexpected indexing interface. Fix up the c

Replace {load,store}_u32_be() with crypto_{load,store}_be32toh().

load_u32_be() and store_u32_be() are not symmetrical, with load_u32_be()
having a rather unexpected indexing interface. Fix up the callers to
perform their own indexing and use crypto_{load,store}_be32toh() instead.

ok tb@

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Pull the family key and constant key tables out of SM4_set_key().

ok tb@

Replace rotl() with crypto_rol_u32().

ok tb@