Fix libgit2-sys rerun-if-changed on Windows #916
Merged
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This fixes it so that the libgit2-sys build script will re-run if any of the libgit2 source files changes. There was an early exit return that was preventing the code from running on Windows.
This also removes the built-in recursion support. Cargo was updated in Rust 1.50 to have this support built-in.