Further simplify the rc4 implementation.

The RC4_CHUNK related code is intended to process native word sized
chunks if the input and output are naturally aligned. However, RC4_CHUNK
is currently a mess of machine dependent defines.

Replace this with uint64_t on all architectures - 64 bit architectures will
be happy with this and on 32 bit architectures the compiler can decompose
this into multiple 32 bit operations. Provide separate rc4_chunk()
implementations for big and little endian, since not all architectures
have a byte swap instruction that would make this a cheap conversion.

Thanks to gkoehler@ and tb@ for testing on big endian.

ok tb@

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