Use external/webrtc/ from CM

Webrtc needs fixing for ARMv5/6 targets.
Someone please fork from aosp.

Change-Id: I0208c1488fb35ba0c9c4dc69114d78aae9d8429b

default.xml

@@ -155,7 +155,7 @@
   <project path="external/valgrind" name="CyanogenMod/android_external_valgrind" />
   <project path="external/webkit" name="CyanogenMod/android_external_webkit" />
   <project path="external/webp" name="CyanogenMod/android_external_webp" />
-  <project path="external/webrtc" name="platform/external/webrtc" remote="aosp" revision="refs/tags/android-4.0.4_r1.1" />
+  <project path="external/webrtc" name="CyanogenMod/android_external_webrtc" />
   <project path="external/wireless-tools" name="CyanogenMod/android_external_wireless-tools" />
   <project path="external/wpa_supplicant" name="CyanogenMod/android_external_wpa_supplicant" />
   <project path="external/wpa_supplicant_6" name="CyanogenMod/android_external_wpa_supplicant_6" />