Add more function prototypes to avoid implicit function declarations

[fweimer-rh]

These functions are used in other parts of the codebase. Future compilers may reject implicit function declarations by default; they were removed from C in 1999.

Related to:

• https://fedoraproject.org/wiki/Changes/PortingToModernC
• https://fedoraproject.org/wiki/Toolchain/PortingToModernC

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[elizabethjoshi]

need a Contributor License Agreement to proceed.
Check: https://github.com/facebook/tac_plus/pull/36/checks?check_run_id=10203698271

[RollerMatic]

hey @fweimer-rh , do you mind accepting the CLA ? We can merge this with master, but need the stamp