[Bug 273915] graphics/openshadinglanguage, graphics/opencolorio, graphics/openimageio error in cmake config file

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273915

--- Comment #3 from Adriaan de Groot <adridg@freebsd.org> ---
I have checked, the problem looks like it is entirely in CMake's
find_package(ZLIB), not opencolorio:

```
cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
project(demo VERSION 1.0 LANGUAGES C)

find_package(ZLIB REQUIRED)

message(STATUS "::")
message(STATUS ":: ZLIB_VERSION=${ZLIB_VERSION}")
message(STATUS ":: ZLIB_VERSION_STRING=${ZLIB_VERSION_STRING}")
message(STATUS "::")
```

On 13-, with ZLIB 1.2.13, prints something normal, and on 14-, with ZLIB 1.3,
adds the #define garbage to the value of variable ZLIB_VERSION.

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