This also disables catch for some other builds that happen to be in the same
matrix. But there are still plenty of builds running with DOWNLOAD_CATCH=ON.
Workaround for a windows-only download issue that started yesterday (2020-06-23):
-- Downloading catch v2.13.2...
CMake Error at tools/FindCatch.cmake:40 (message):
Could not download
https://github.com/philsquared/Catch/releases/download/v2.13.2/catch.hpp
Call Stack (most recent call first):
tools/FindCatch.cmake:59 (_download_catch)
tests/pure_cpp/CMakeLists.txt:1 (find_package)