enable sincos optimization on cygming targets

[Jonathan Yong]

On 10/22/20 5:01 AM, Alexandre Oliva wrote:
> Err, sorry, I mislabeled this patch as [FYI,Ada], but it is neither
> about Ada nor pre-approved.  It does require a review before I can check
> it in.
> 

No objections for mingw-w64 since it has been tested, but I'm not 
certain if the original mingw.org version has it.

Please also do a test build for Cygwin, it uses a different runtime from 
mingw-w64.
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