Fixing invalid linking for Linux that obviously wasn't properly tested in the cleanup of http://webrtc-codereview.appspot.com/406002/

TBR=mflodman
BUG=None
TEST=Compiled on Linux Debug+Relase.

Review URL: https://webrtc-codereview.appspot.com/425001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1803 4adac7df-926f-26a2-2b94-8c16560cd09d

src/video_engine/test/auto_test/vie_auto_test.gypi

@@ -124,6 +124,14 @@
             'vie_win_test',
           ],
         }],
+        ['OS=="linux"', {
+          # TODO(andrew): these should be provided directly by the projects
+          #   # which require them instead.
+          'libraries': [
+            '-lXext',
+            '-lX11',
+          ],
+        }],
         ['OS=="mac"', {
           'xcode_settings': {
             'OTHER_LDFLAGS': [