Suppress implicit declaration warnings.

Import mkhybrid from OpenBSD 7.3 to create ISO9660/HFS hybrid ISO images.

- files in libfile except proto.h prepared by OpenBSD are not imported
due to non-standard license
(newer BSD Licensed v

Import mkhybrid from OpenBSD 7.3 to create ISO9660/HFS hybrid ISO images.

- files in libfile except proto.h prepared by OpenBSD are not imported
due to non-standard license
(newer BSD Licensed versions will be imported later)
- unnecessary files for tools build are not imported
- RCSId strings are trimmed to avoid unintended substitutions

Proposed on tech-toolchain@:
https://mail-index.netbsd.org/tech-toolchain/2024/05/25/msg004355.html

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