Add kissfft repo for WebAudio

Change-Id: I2c4369c3cc490289b9d31ffa35a7e8076a0d7a3f
diff --git a/default.xml b/default.xml
index 19aabc1..73a39f2 100644
--- a/default.xml
+++ b/default.xml
@@ -123,6 +123,7 @@
   <project path="external/jsr305" name="CyanogenMod/android_external_jsr305" />
   <project path="external/junit" name="CyanogenMod/android_external_junit" />
   <project path="external/kernel-headers" name="CyanogenMod/android_external_kernel-headers" />
+  <project path="external/kissfft" name="CyanogenMod/android_external_kissfft" />
   <project path="external/koush/ion" name="CyanogenMod/ion" />
   <project path="external/koush/AndroidAsync" name="CyanogenMod/AndroidAsync" />
   <project path="external/koush/Superuser" name="CyanogenMod/Superuser" />