add Looper.cpp to build for linux host to use in CTS audio

Change-Id: I59cfe30fd48fcba0bb949033f4d2aef5ce9916e4
diff --git a/libs/utils/Android.mk b/libs/utils/Android.mk
index 5df630d..ddfb83e 100644
--- a/libs/utils/Android.mk
+++ b/libs/utils/Android.mk
@@ -67,6 +67,9 @@
 # =====================================================
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES:= $(commonSources)
+ifeq ($(HOST_OS), linux)
+LOCAL_SRC_FILES += Looper.cpp
+endif
 LOCAL_MODULE:= libutils
 LOCAL_STATIC_LIBRARIES := libz
 LOCAL_C_INCLUDES := \
@@ -80,6 +83,9 @@
 # =====================================================
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES:= $(commonSources)
+ifeq ($(HOST_OS), linux)
+LOCAL_SRC_FILES += Looper.cpp
+endif
 LOCAL_MODULE:= lib64utils
 LOCAL_STATIC_LIBRARIES := libz
 LOCAL_C_INCLUDES := \