This patch updates CMake to version 3.15.5, which fixes some bugs as listed
here: <https://cmake.org/cmake/help/v3.15/release/3.15.html#updates>

I've been trying the package built from this patch for some days and it seems
to work ok and indeed fix the issues that were affecting us.

Thanks and cheers!

-- 
Ivan Vilata i Balaguer -- https://elvil.net/