Change FIELD_OFFSET macro to remove requirement for unaligned_references
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unaligned_referencesis made into a hard error as per rust-lang/rust#102513 which will cause the FIELD_OFFSET macro to fail for packed structs. rust-lang/rfcs#3308 looks to implement this in core::mem however in the meantime this change passes all tests in layout_x86_64.rs on rustc 1.70.0-nightly (900c35403 2023-03-08)