Use libsndfile to write .wav files

This will reduce code duplication, and allow us take advantage of more
advanced capabilities of libsndfile in the future.

Change-Id: I25fa2b6d0c21e325aeaf05bda62cf7aab0c5deb4
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index 54377f1..3ec9285 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -79,7 +79,14 @@
 	AudioResamplerCubic.cpp.arm \
     AudioResamplerSinc.cpp.arm
 
+LOCAL_C_INCLUDES := \
+    $(call include-path-for, audio-utils)
+
+LOCAL_STATIC_LIBRARIES := \
+    libsndfile
+
 LOCAL_SHARED_LIBRARIES := \
+    libaudioutils \
     libdl \
     libcutils \
     libutils \