Martin Duffy 857a039d66 find_*: Add variable to default calls to REQUIRED ...

This adds a `CMAKE_FIND_REQUIRED` variable which causes `find_package`,
`find_path`, `find_file`, `find_library` and `find_program` to be
considered `REQUIRED` by default.

It also introduces an `OPTIONAL` keyword to those commands, allowing
them to ignore the value of this variable.

Issue: #26576

2025-02-27 10:51:07 -05:00

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