Fix git commit updating

AnyOldName3requested to merge
fix-git-commit-updating into master
  • Switch back to add_custom_target so this gets run every build, removing the regression from !3382 (merged) forcing you to reconfigure if you wanted a change to be noticed.
  • Process version.cpp to an intermediate file instead of overwriting the potentially-already-up-to-date one, which would force it to be rebuilt, components to be re-archived, and all binaries to be relinked.
  • Only overwrite the existing version.cpp if there's a change.

Discussed here: !3909 (comment 1788291551)

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