Support for ROCM/HIP

[tmagik]

What's the right place to start for adding support for HIP to meson? I assume we'd need to add the support, submit a PR, and then probably include the required meson version in the project so we don't have to wait for distros to catch up.

See the following for more background.
https://rocm.docs.amd.com/projects/HIP/en/latest/reference/cpp_language_extensions.html
https://github.com/fluidnumerics/SELF