Upstream system package introspection abilities from pib

[klauer]

Expected Behavior

pib has a WIP feature of introspecting pretty much all supported *_LIBS_* variables from modules.

This includes:

• General and per-OS class system packages that are required
• Information on all libraries that are to be linked to generate an IOC binary
• And a few other things

Reference from EPICS docs:

https://docs.epics-controls.org/en/latest/appdevguide/EPICSBuildFacility.html

Specifically the variables from this table:

Current Behavior

whatrecord doesn't have this ability and only looks at top-level makefile information by default

Possible Solution

Clean up and upstream the functionality to whatrecord