Remove H5_NO_ALIGNMENT_RESTRICTIONS (#1426)

* Do not conditionally compile code that uses a pointer dereference
and assignment to copy a potentially unaligned variable to aligned
automatic storage, or vice versa.  Instead, always use naked `memcpy(3)`s.
Disassembling the generated code reveals that the `memcpy(3)`s optimize
(`-O3`) to a single `mov` instruction for x86_64, which is not strict
about alignment.

This change reduces the size of code and scripts by 143 lines, eases
our way to cross-compilation, and avoids invoking undefined behavior.

* Committing clang-format changes

* Per discussion, use HD and add comments.

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

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