* make_package_relative: relocate rpaths on cray

* relocate_package: relocate rpaths on cray

* platforms: add `binary_formats` property

We need to know which binary formats are supported on a platform so we
know which types of relocations to try. This adds a list of binary
formats to the platform and removes a bunch of special cases from
`binary_distribution.py`.

Co-authored-by: Todd Gamblin <tgamblin@llnl.gov>