The previous version does not properly install the required cmake
configuration files for blaze-lib, so find_package does not work
correctly.
This patch converts the blaze-lib package to use CMakePackage,
adds the required cmake dependency, and removes the install()
member function, which is not working correctly and is no longer
needed.
- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
