Fix SockaddrLike::from_raw with unaligned inputs

The major users of this function are functions like gethostname, which
will always properly align their buffers.  But out-of-crate consumers
could manually construct an unaligned buffer.  Handle that correctly.

Enable Clippy's cast_ptr_alignment lint.  It's disabled by default as it
reports many false positives, but it would've caught this problem.

Reported-by:	Miri
Fixes:		1769

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