Allow checking if CMake has SSL support
It would be useful to allow checking if CMake was built with SSL support. I received several complaints that https download failed, caused by manually compiled CMake, without SSL support.
This could be a simple variable, i.e. something like
if (NOT CMAKE_HAS_SSL_SUPPORT) message(FATAL_ERROR "...") endif()
or, eventually in the
cmake_minimum_required command, for example
cmake_minimum_required(VERSION 3.18 FEATURES SSL)