Raphael Gozzo 8346836471 [curl] Build openssl and schannel backends by default (#3932)
* [curl] Split the OpenSSL and SChannel backends into separate features

* [curl] Add mbedTLS backend as a feature

* [curl] Make winssl the default for Windows. Remove need for compatibility workaround.

* [curl] Continue to use openssl in UWP because PSecurityFunctionTableA is not available.
2018-11-30 16:37:54 -08:00
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