Installing zstd CMake files

[mcalhoun at macports.org]

The package opencolorio uses CMake to find minizip-ng.
The minizip-ng’s CMake files assume that the CMake files of zstd exist.
However, the CMake files of zstd are installed if and only if zstd is built with CMake (*not* make).
According to the README.md of zstd, "`make` is the officially maintained build system of this project.”
Further, zstd is a dependency of clang.

My proposed solution is to create a subport of zstd that just installed the CMake files
(https://github.com/macports/macports-ports/pull/18605/).

This is *far* from an ideal solution, and I was hoping someone else would have a better idea.

Thanks,
Marcus
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