Revert "check_packed_git_idx(): check integrity of the idx file itself."
This reverts c5ced645 commit. It turns out that doing this check every time we map the idx file is quite expensive. A corrupt idx file is caught by git-fsck-objects, so this check is not strictly necessary. In one unscientific test, 0.99.9m spent 10 seconds usertime for the same task 1.1.3 takes 37 seconds usertime. Reverting this gives us the performance of 0.99.9 back.
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