* Adding version 2.0.12 of numactl.
* Adding new versions of hwloc.
* Adding NVML variant to hwloc.
* Adding gl variant to hwloc.
* Updating hwloc numactl dependency and gl dependency.
* Using gl virtual package in hwloc.
- 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
