Make audio_extn build with the VNDK.
am: a53524288e

Change-Id: I1325636e923cdcdfd8d5209b5c3a0cee52ce649c
diff --git a/hal/audio_extn/a2dp.c b/hal/audio_extn/a2dp.c
index 516383a..1a9421b 100644
--- a/hal/audio_extn/a2dp.c
+++ b/hal/audio_extn/a2dp.c
@@ -20,6 +20,7 @@
 
 #include <dlfcn.h>
 #include <errno.h>
+#include <pthread.h>
 #include <stdlib.h>
 
 #include <cutils/log.h>
diff --git a/hal/audio_extn/cirrus_playback.c b/hal/audio_extn/cirrus_playback.c
index 18513af..595ac85 100644
--- a/hal/audio_extn/cirrus_playback.c
+++ b/hal/audio_extn/cirrus_playback.c
@@ -31,6 +31,7 @@
 #include <stdio.h>
 #include <dlfcn.h>
 #include <math.h>
+#include <pthread.h>
 #include <time.h>
 #include <unistd.h>
 #include <cutils/properties.h>