Use bundled zlib

bording · bording · commit 1772c5093d4d · 2018-11-28T20:40:39.000-05:00
diff --git a/build.libgit2.sh b/build.libgit2.sh
@@ -15,6 +15,7 @@ cmake -DCMAKE_BUILD_TYPE:STRING=Release \
       -DENABLE_TRACE=ON \
       -DLIBGIT2_FILENAME=git2-$SHORTSHA \
       -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" \
+      -DUSE_BUNDLED_ZLIB=ON \
       ..
 cmake --build .
 
