add a dependency on -lz to freetype2.
add a dependency on -lz to freetype2.

It turns out that the lucid system freetype looks like it was compiled
with a dependency on the system zlib (unsurprisingly). In the custom build
I just added, I missed declaring the link library dependency on -lz.

I'm not sure if this will correctly interact w/ use_system_zlib, but this
appears to reproduce the existing correct build properly (which depends
on the system zlib even if use_system_zlib is set to zero), so perhaps
use_system_zlib is broken for DRT?

R=tony@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/12316085

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@184539 0039d316-1c4b-4281-b951-d872f2087c98

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