Use void casts to silence warnings about memcpy to a class #3800
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This was previously silenced by passing -Wno-class-memaccess, to the compiler, if it was supported (for GCC, it was supported since GCC 8).
Clang supports a similar option, -Wno-nontrivial-memaccess since Clang 8. It didn't use to warn about these cases, but since Clang 20, it also warns about this.
Simplify handling the issue by just adding void casts, to avoid needing to check for whether the options for silencing the warnings are supported.
This silences these warnings when building with Clang 20.