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Enable SCTP target in libjingle.gyp. SCTP was already existed in Chrome third_party for a while but never used. Libjingle is trying use it for DataChannels.

Review URL: https://chromiumcodereview.appspot.com/16196007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205864 0039d316-1c4b-4281-b951-d872f2087c98