`_memcpy!` not defined on nightly

[evetion]

Encountered at https://github.com/evetion/SpaceLiDAR.jl/actions/runs/5832259983/job/15817324791?pr=56#step:6:371

  Got exception outside of a @test
  UndefVarError: `_memcpy!` not defined
  Stacktrace:
    [1] _generic_read(::HDF5.Attribute, ::HDF5.Datatype, ::Type{Cstring}, ::Nothing)
      @ HDF5 ~/.julia/packages/HDF5/aiZLs/src/readwrite.jl:197
    [2] generic_read(::HDF5.Attribute, ::HDF5.Datatype, ::Type{Cstring})
      @ HDF5 ~/.julia/packages/HDF5/aiZLs/src/readwrite.jl:134
    [3] read(obj::HDF5.Attribute)
      @ HDF5 ~/.julia/packages/HDF5/aiZLs/src/readwrite.jl:39
    [4] read_attribute(parent::HDF5.Group, name::String)
      @ HDF5 ~/.julia/packages/HDF5/aiZLs/src/attributes.jl:54

[mkitti]

Thanks for the note. I plan on doing some work on the package this weekend, and I will address this.

[eschnett]

This error occurs for me as well on HDF5 v0.16.15 with Julia Version 1.10.0-beta2, not just on nightly.

[mkitti]

It's already fixed on master

[mkitti]

To resolve this, I am planning a 0.16.16: https://github.com/JuliaIO/HDF5.jl/pull/1098

[evetion]

Thanks!