deps/yara: force rebuild if config changed, fix #760

[PeterMatula]

No description provided.

[PeterMatula]

lets run tc tests

[PeterMatula]

@s3rvac can you have a look? It works for me, but this kind of things are tricky, so I would feel better if someone else tried it and looked at the solution.

Ad solution: it is complicated by:

• external project configuration is different for MSVC than for other environments
• YARA is not built using CMake, but in source using make/MSVC solution
• simply triggering rebuild without cleaning does not work. CMake will not download the package again [and clean everything] because it did not change, and in-source build will not properly rebuild if it was already built.

[s3rvac]

Sure, I will take a look.

[s3rvac]

Works well for me on Linux and I do not see anything wrong with the code. So, approving 👍 Thank you for looking into that. I think it will prevent possible headaches with changing YARA parameters in the future.