[PATCH 2/2] Use C11 _Alignas on scratch_buffer internal buffer

[Paul Eggert]

Adhemerval Zanella wrote:
> Now back to the patch topic, I think the first union version [1] should
> the most suitable one and it is what I am intended to push.
> 
> [1]https://sourceware.org/ml/libc-alpha/2017-09/msg00730.html

The code for that looks fine for Gnulib. However, the commit message could be 
improved. It needs a summary line that does not mention _Alignas. "an union" 
should be "a union". There is no need to cite every use affected by the change; 
just say "All uses changed". It would be nice to credit Florian for pointing out 
the problem and Andreas for suggesting a solution.

Attached is a proposed patch to Gnulib, which uses the same code as the 
abovementioned glibc patch, but which has an improved commit message; please use 
it as a guideline for the glibc commit.

One more thing. Gnulib and other GNU projects are switching to using https: URLs 
to gnu.org and to fsf.org, and this causes the shared glob sources to differ in 
one line. Glibc should be fixed to use https: instead of http: for citations to 
GNU and FSF web sites. That should be a separate patch, of course. I'll look 
into it.
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