Steve Holme in gmane.comp.web.curl.library (Thu, 19 May 2016 21:27:42
+0100):
>nmake /f Makefile.vc mode=static VC=14 ENABLE_SSPI=yes ENABLE_IPV6=yes \
> ENABLE_IDN=yes ENABLE_WINSSL=yes DEBUG=no MACHINE=x64

The PHP devs use WITH_SSL=dll ENABLE_WINSSL=no. See
https://github.com/winlibs/cURL
This breaks on the exclusivity.

>Any pointers or ideas as to what is different, and also why the vtls
>directory is created for you, would be much appreciated.

See my other reply: I could not reproduce it anymore. Sorry for the fuzz.

-- 
Jan
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