Add explicit cutils to stagefright

Without this, some changes I'm making over in frameworks/native
result in a link-time failure to find android_atomic_dec.

Change-Id: Ieb45a86ef6508816ac51589e249ff89caf7ba309
diff --git a/cmds/stagefright/Android.mk b/cmds/stagefright/Android.mk
index f60b1a4..a59186a 100644
--- a/cmds/stagefright/Android.mk
+++ b/cmds/stagefright/Android.mk
@@ -9,7 +9,7 @@
 
 LOCAL_SHARED_LIBRARIES := \
 	libstagefright libmedia libutils libbinder libstagefright_foundation \
-        libjpeg libgui
+        libjpeg libgui libcutils
 
 LOCAL_C_INCLUDES:= \
 	frameworks/av/media/libstagefright \