[Improve] `./hooks/pre-commit`; affix list of functions used onto `#include`'s (for C++) and onto `. `'s (for `/bin/sh`)

[SwuduSusuwu]

Rationales:

• Manual updates are tedious and error prone.

Background:

• @./README.md#purposes; +./hooks/pre-commit. @d1a9412
• @./README.md#purposes; +./tags (ctags cache) @038444a
• [Improve] ./hooks/pre-commit; produce posts/VirusAnalysis.md. #60