Patch to allow building when Xcode is set to use a custom build location

[Josh Bleecher Snyder]

Hi all,

If you've set Xcode to use a custom build location (Xcode >
Preferences > Building), the "Compile libgit2" script currently fails.
Find attached a patch to accomodate custom build locations.

-josh

0001-Fix-build-script-when-using-centralized-build.patch
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