hal: Fix compilation errors

Fix compilation errors for hal test apps

Change-Id: I7cc6b62a5722af8ccef58d242817970c223a5782
diff --git a/qahw/src/qahw_effect.c b/qahw/src/qahw_effect.c
index 9bee2a1..ff92f73 100644
--- a/qahw/src/qahw_effect.c
+++ b/qahw/src/qahw_effect.c
@@ -37,7 +37,7 @@
 #include <hardware/audio.h>
 #include <hardware/audio_effect.h>
 #include <stdlib.h>
-
+#include <pthread.h>
 #include "qahw.h"
 
 // The current effect API version.