Make AlignedKeccakState repr(C) #7
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The default [repr(Rust)](https://doc.rust-lang.org/reference/type-layout.html#the-rust-representation) representation makes no guarantees about layout or alignment of its members, but we want (1) a pointer to AlignedKeccakState be the same as a pointer to its member, and (2) the member to be aligned. repr(C, align(8)) achieves that.
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The default repr(Rust) representation makes no guarantees about layout or alignment of its members, but we want (1) a pointer to AlignedKeccakState be the same as a pointer to its member, and (2) the member to be aligned. repr(C, align(8)) achieves that.