Avoid zlib symbol conflicts in open-vcdiff

Roll open-vcdiff from 40 to 42 to include the changes about zlib files (http://code.google.com/p/open-vcdiff/source/detail?r=41)

Exclude zlib files when building open-vcdiff for Chromium to avoid link warning due to name conflict with zlib.

BUG=116308

Review URL: http://codereview.chromium.org/9555002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@130552 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed