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On both Lucid and Natty, cups-config --libs includes cflags and other
unneeded output.  Parse the cups-config output to emit only the relevant
subsets of flags.

Review URL: http://codereview.chromium.org/7633022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96635 0039d316-1c4b-4281-b951-d872f2087c98