make: Export WRAPPER_NAME when running postbuilds.
make: Export WRAPPER_NAME when running postbuilds.

The "Symlink Libraries" postbuild step in chromium reads it.

BUG=chromium:100990
Review URL: http://codereview.chromium.org/8360020

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1081 78cadc50-ecff-11dd-a971-7dbc132099af

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