a bit of everything

This only shows up in linux because the cmake script was changed to run ./configure, the generated curl_config.h does not match the static ones we have already generated for other platforms. The real fix would be to add `–without-libssh2` to the curl configure command line in the curl/cmakelists.txt file under cmake/thirdparty. This would remove dependency on libssh2 being installed on linux boxes where the game is distributed to and bring it in line with the other platforms libcurl support.