tree: don't use system stat constants #25
Merged
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On most Unix systems, the stat constants (S_IFMT and friends) that Git uses are the same: that is, the system values are the same ones that Git uses. However, on zOS, this isn't the case, and the system constants are different.
Let's add a set of our constants that are used by Git to determine the type of an object that will be right on all platforms instead of using the system constants. Note that the tests already cover this case; they'll just now pass on additional systems.
Fixes #24