Turn off shared building of physfs.
Turn off shared building of physfs.

It needs -fPIC, but I'm not sure how to turn that on in cmake. :P

BUG=none
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/14189034

git-svn-id: 84b3587ce119b778414dcb50e18b7479aacf4f1d@733 7dad1e8b-422e-d2af-fbf5-8013b78bd812

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