Thomas Dickerson c263b64d2e Racket package: disable parallel build; add variants (#27506) ... - Prevent `-j` flags to `make`, which has been known to cause problems with Racket builds. - Add variants for various common build flags, including support for both versions of the Racket VM environment. In addition: - Prefer the minimal release to improve install times. Bells and whistles carry their own runtime dependencies and should be installed via `raco`. An enterprising user may even create a `RacoPackage` class to make spack aware of `raco` installed packages. - Match the official version numbering scheme.		2021-11-23 16:45:18 -08:00
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package.py	Racket package: disable parallel build; add variants (#27506)	2021-11-23 16:45:18 -08:00