some of these are not resolvable in that there is only an http page
available, or a page reported as broken is actually ok, or a page has
an SSL error that does not prevent one from visiting (and no good replacement)
Signed-off-by: vsoch <vsoch@users.noreply.github.com>
Co-authored-by: vsoch <vsoch@users.noreply.github.com>
Example replacement:
```
'-D(\w+)(:BOOL)?=\{0\}'\.\s*format\s*\(\s*'(ON|YES|true|TRUE)' if '\+(\w+)' in (self\.)?spec else '(OFF|NO|false|FALSE)'\)
```
with
```
self.define_from_variant('\1', '\4')
```
This will cause failures if any variants were misspelled: I have already caught two packages with nonexistent variants.
* ArrayFire: Add version 3.7.2.
* ArrayFire: Allow using MKL as the FFTW provider.
* ArrayFire: Ensure the libraries are properly found.
The required backend(s) can be specified in the library query.
- [x] add `concretize.lp`, `spack.yaml`, etc. to licensed files
- [x] update all licensed files to say 2013-2021 using
`spack license update-copyright-year`
- [x] appease mypy with some additions to package.py that needed
for oneapi.py
