Fix printing variables that have inherit references in them

Inherit references (@inherit in make, 1-tuples in starlark)
usually appear in list product variables, where they're
evaluated before printing. But sometimes they can be copied
into a regular global variable, in which case they won't
be evaluated before printing. The 1-tuples were failing to
print, so adapt them to their make representation before
printing.

Fixes: 264554449
Test: ./out/rbcrun ./build/make/tests/run.rbc
Change-Id: I5ac6eb996c25ee5e77aa26ed5c4b6b6cc31819d1