[Bug libstdc++/67578] std::random_device::entropy() always returns 0

[ryxi at stu dot xidian.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67578

Xi Ruoyao <ryxi at stu dot xidian.edu.cn> changed:

           What    |Removed                     |Added
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                 CC|                            |ryxi at stu dot xidian.edu.cn

--- Comment #1 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
Created attachment 40951
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40951&action=edit
patch

Is this OK?

Or maybe we should keep the ABI unchanged and put all the implementation
in the header random.h?