[plabondutta]

CI was failing on every PR into STRATA-5.5.0 before it got to any tests.
All the build jobs stopped at the same line:

runtime/array.c:20: fatal error: numa.h: No such file or directory

The GitHub runners don't have libnuma-dev installed, and macOS and Windows
don't have libnuma at all.

This PR:

• installs libnuma-dev in the Linux jobs (including the i386 container and
  the Hygiene build) and links with -lnuma
• filters the macOS jobs out of the build matrix. Their definitions stay in
  the file, so changing return jobs.filter(...) back to return jobs;
  brings them back
• disables the Windows workflow (if: false on its config job) instead of
  deleting it
• adds a Changes entry, which the Hygiene check requires for every PR
• removes some trailing whitespace and wraps one long comment in
  runtime/array.c, which the style check was flagging
• adds a flambda-specific reference for tests/backtrace/event_after_prim.
  Array.make is now an OCaml wrapper (for ?far), and flambda inlines it, so
  native flambda builds print "array.ml" (inlined) in the backtrace. The
  existing reference only matched non-flambda builds.

The workflow triggers are unchanged, and nothing in the runtime behaviour
changes.

[Binkersss]

Nice, this looks good.