Generated header files not getting used correctly

[skliper]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug Doesn't implement current pattern for generated files

To Reproduce Use a cfs_msgid.h file in *_defs and watch it burn

Expected behavior Should use global override

System observed on:

• OS: Ubuntu 22
• Versions: main-ish (some project customizations)

Additional context None

Reporter Info Jacob Hageman - NASA/GSFC