Enable building WebRTCDemo apk using Release webrtc libs, take 2.
Enable building WebRTCDemo apk using Release webrtc libs, take 2.

Now passing BUILDTYPE=Release to both the make that builds the libs and the
ndk-build that builds the app makes the app use non-Debug libs.

Review URL: https://webrtc-codereview.appspot.com/966029

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@3201 4adac7df-926f-26a2-2b94-8c16560cd09d

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