enable sincos optimization on cygming targets

[Jonathan Yong]

On 10/22/20 11:30 AM, Alexandre Oliva wrote:
> On Oct 22, 2020, Jonathan Yong wrote:
> 
>> No objections for mingw-w64 since it has been tested, but I'm not
>> certain if the original mingw.org version has it.
> 
> Prompted by you, I looked into the original mingw32, and found it does
> NOT have sincos, so I withdraw the patch, in favor of this one.  Since
> this one affects only mingw-w64, I haven't checked whether cygwin has
> it.  Hopefully someone with easier access to the platform can do so and
> duplicate the change in the Cygwin-specific compiler configuration
> header.
> 

Thanks this patch is acceptable.


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