Move system_wrappers.gyp files to the proper directory.
Move system_wrappers.gyp files to the proper directory.

Build targets should not refer to non-subpaths as was happening before when
 source/system_wrappers.gyp refers to ../interface/ files.

R=kjellander@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/37609004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@8057 4adac7df-926f-26a2-2b94-8c16560cd09d

dcpang/fatline-libjingle,sippet/talk,sippet/talk,dcpang/fatline-libjingle,dcpang/fatline-libjingle,dcpang/fatline-libjingle,dcpang/fatline-libjingle,sippet/talk,sippet/talk,sippet/talk