preserve zlib tree, to use bundled (patched) zlib

see https://code.google.com/p/chromium/issues/detail?id=143623

diff --git a/clean-source.sh b/clean-source.sh
index 437380fb3f6969c387ddb1fa84e77ce9eb414af8..32475623a83ace69ccf4bd7819636ed8aea82589 100755 (executable)
--- a/clean-source.sh
+++ b/clean-source.sh
@@ -280,7 +280,7 @@ strip_system_dirs \
        third_party/libpng \
        _third_party/libxml \
        third_party/libxslt \
-       third_party/zlib \
+       _third_party/zlib \
        third_party/libwebp \
        _third_party/libvpx \
        v8 \