crypto: Fix DH private key length type mismatch

[ruslandoga]

enif_get_uint64() writes through an ErlNifUInt64 *, while
OSSL_PARAM_construct_uint64() builds a parameter pointing to uint64_t
storage. On macOS arm64, those are equally wide but distinct C types:
ErlNifUInt64 is unsigned long, while uint64_t is unsigned long long.

Fixes #11511

[github-actions]

CT Test Results

  2 files   14 suites   4m 25s ⏱️
195 tests 177 ✅  18 💤 0 ❌
497 runs  346 ✅ 151 💤 0 ❌

Results for commit 74edf11.

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[Mikaka27]

Could you rebase the branch from patch-base-27 tag?

[Mikaka27]

Well, there are conflicts on github unfortunately :(. In that case you can base it again on maint, and we will create more branches for older releases internally. Sorry about that :(

[Mikaka27]

I think we can avoid the copy (and additional variable on stack) by having a union with ErlNifUint64 and uint64_t instead, what do you think about this approach?