Ignore build files generated if built from project root

[mratzloff]

No description provided.

[adishavit]

Thanks for the PR! Quick question: is there a specific reason you're building from the project root rather than using an out-of-source build directory (e.g. mkdir build && cd build && cmake ..)? Out-of-source builds keep the repo root clean without needing to enumerate generated files in .gitignore. Curious about the use case.

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