i was able to figure out hopefully how to fix one of the FIXMEs remaining in #5815 by adding a BinaryTool for

glibc

with https://github.com/pantsbuild/pants/pull/5943 (corresponding binaries pr at https://github.com/pantsbuild/binaries/pull/70) to unskip some all the currently-skipped native backend tests (which just try to run a hello world)