- 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
* libtool: actually do symlinking correctly on darwin
Version 4 of the libtool/darwin debacle:
AutotoolsPackage hardcodes libtool & libtoolize into the autoreconf
stage, so the commands `libtool` and `libtoolize` MUST be present, and
shimming in glibtoolize into AutotoolsPackage when sys.platfrom ==
'darwin' does not work.
join_path(spec['libtool'].prefix.bin, 'libtool') still shadows system
BSD libtool (in apple-cctools, see PR #7177), but this shadowing could
be okay, depending on the combination of dependent specs.
* librom: new package
