Track our own external/libvpx

For x86

Change-Id: Id44c119d52b39aacd9dfd353baf340fff189283b
diff --git a/default.xml b/default.xml
index 3c3a18f..d63de13 100644
--- a/default.xml
+++ b/default.xml
@@ -226,7 +226,7 @@
   <project path="external/libusb-compat" name="platform/external/libusb-compat" groups="pdk-cw-fs" remote="aosp" />
   <project path="external/libutf" name="platform/external/libutf" groups="pdk-cw-fs" remote="aosp" />
   <project path="external/libvorbis" name="platform/external/libvorbis" groups="pdk-cw-fs" remote="aosp" />
-  <project path="external/libvpx" name="platform/external/libvpx" groups="pdk" remote="aosp" />
+  <project path="external/libvpx" name="CyanogenMod/android_external_libvpx" groups="pdk" />
   <project path="external/libvterm" name="CyanogenMod/android_external_libvterm" />
   <project path="external/libxml2" name="CyanogenMod/android_external_libxml2" groups="pdk-cw-fs" />
   <project path="external/libxslt" name="CyanogenMod/android_external_libxslt" />