[PATCH] libcxx + MingW: correct printout of long doubles

[G M]

Hi Yaron

I looked at this problem quite a bit a while back, FYI MS's routines are
different from the libcxx versions in other ways too.

I made some changes a while back to reduce and centralize some of the uses
of snprintf in libcxx a while back in order to generally try to move
towards what your patch proposes.

I generally approve of where you are going with this patch. I'll apply it
on my machine this weekend and try your patch out and contrast it with VS
builds with it and report soon in more detail.

I think it's a good area to focus on. Thanks for looking at this.
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