Update CURL

[jgsogo]

I have submitted a PR tu bagder/curl (curl/curl#488) with the same content as the one submitted to your fork, now I'm testing whoshuu/cpr#master with bagder/curl#master and everything seems to work ok (Win7 64bits MSVC2015).

I've just had to choose in CMake between CMAKE_USE_OPENSSL and CMAKE_USE_SCHANNEL because under both macros there is the same definition in curl/lib/urldata.h (line#273 and line#322)

ssl_connect_state connecting_state;

Both seems to be "ON" by default... I don't know what the difference is among all the USE_XXX macros in that file, but I can confirm that last revision works with CPR (I'll try to run all the tests, but my computer crash with them :S)

Update this dependency (after PR merge and tag so install in windows works ok)?

[whoshuu]

I've already updated my local curl dependency with your change in f9a3159. I'll close this issue when the upstream curl repo gets updated, and I point my fork to it. Thanks for the information.

[jgsogo]

This issue now depends on this pull-request: curl/curl#498

[jgsogo]

The PR have been merged, It is already available in #master branch and will be shipped with v7.46.0

[whoshuu]

Hey @jgsogo, really appreciate the work you've done to push this through. When that version of curl gets shipped and I point my submodule to it, I'll go ahead and close this ticket.

[jgsogo]

Thanks @whoshuu

[whoshuu]

This can be closed after updating the embedded curl to 7.46.0.