Basic support for OpenSSL 1.1.x on windows #1322
As pointed out in #1201 already, the OpenSSL 1.1.x lib names have changed, which as consequence makes impossible to link cURL with OpenSSL > 1.0.2. While the aforementioned PR suggested to make lib names configurable, it were also dicussed to first care about the build process present currently. This PR goes for this, the library names are determined by checking the physical existence of the certain files. The newer OpenSSL libs are preferred, while in general there's no change to the current build approach. The only condition is, that the DEVEL dir has to contain either one or the other set of libs, not both at once.