On Windows, gyp seems to require valid source files. The matlab_plotting_test target was missing its one source file, so I removed the target.
Also moving bwe_standalone.gypi to the test include list.
Review URL: http://webrtc-codereview.appspot.com/143001
git-svn-id: http://webrtc.googlecode.com/svn/trunk@589 4adac7df-926f-26a2-2b94-8c16560cd09d