Revert "Remove font.c code commented out for a decade"
This reverts commit 64d0cd98. Rationale: any font-related code and comments, even if unused for decades, serves as important source of useful information in an area of Emacs code that is notoriously under-documented. Please do NOT remove this stuff until we have an active expert in this are on board, who will then decide whether this can be retired.
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