packaging follows https://build.opensuse.org/package/view_file/devel:libraries:c_c++/lapack/lapack.spec with a few differences:
- not making static library subpackages
- not using update-alternatives
- not including man pages
- using cmake instead of a few hundred lines of manually messing with makefile fragments
- not building LAPACKE, since it's not enabled by default with the cmake build. I can look into changing this if someone needs the lapacke library.
- not running the tests
- deleting the installed cmake and pkg-config files, both indicate wrong version numbers (upstream bug in the cmake files) and caused issues with satisfying the Provides: mingw64-blas part of the spec file