The motivation is to exclude the file from diffs on GitHub's web
interface [1] and to exclude it from checkpatch checks [2].

[1]: https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github
[2]: https://github.com/tarantool/checkpatch/pull/75

NO_DOC=the patch is about the development process, it doesn't change
       anything in the shipped product
NO_CHANGELOG=see NO_DOC
NO_TEST=see NO_DOC

(cherry picked from commit fbea9862b087e161a48dc0ac181a1da06cc0ce9d)

This improves diff hunk name detection. Needed for checkpatch to
correctly detect if patched code belongs to a function.

NO_DOC=git
NO_TEST=git
NO_CHANGELOG=git

(cherry picked from commit 642584fd)

We often commit snap/xlog files for tests. A snap/xlog file is binary,
but it contains a plain text header and, as a result, may be identified
as a text file by git, which would enable checkpatch checks for it.
Apparently, we don't need to check these files so let's force git to
identify them as binary.

NO_DOC=git
NO_TEST=git
NO_CHANGELOG=git

(cherry picked from commit 24dd505f)