Threading RS ForEach.

Change-Id: I5d6fe4db2b6ac0613394bc5a066ff90ec146d60e
diff --git a/rsUtils.h b/rsUtils.h
index 0a37a5b..17feb22 100644
--- a/rsUtils.h
+++ b/rsUtils.h
@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <pthread.h>
 #include <time.h>
+#include <cutils/atomic.h>
 
 #ifndef ANDROID_RS_BUILD_FOR_HOST
 #include <EGL/egl.h>